Transistors, the building blocks of modern electronics, are typically made of silicon. Because it’s a semiconductor, this material can control the flow of electricity in a circuit. But silicon has fundamental physical limits that restrict how compact and energy-efficient a transistor can be.

MIT researchers have now replaced silicon with a magnetic semiconductor, creating a magnetic transistor that could enable smaller, faster, and more energy-efficient circuits. The material’s magnetism strongly influences its electronic behavior, leading to more efficient control of the flow of electricity. 

The team used a novel magnetic material and an optimization process that reduces the material’s defects, which boosts the transistor’s performance.

The material’s unique magnetic properties also allow for transistors with built-in memory, which would simplify circuit design and unlock new applications for high-performance electronics.

“People have known about magnets for thousands of years, but there are very limited ways to incorporate magnetism into electronics. We have shown a new way to efficiently utilize magnetism that opens up a lot of possibilities for future applications and research,” says Chung-Tao Chou, an MIT graduate student in the departments of Electrical Engineering and Computer Science (EECS) and Physics, and co-lead author of a paper on this advance.

Chou is joined on the paper by co-lead author Eugene Park, a graduate student in the Department of Materials Science and Engineering (DMSE); Julian Klein, a DMSE research scientist; Josep Ingla-Aynes, a postdoc in the MIT Plasma Science and Fusion Center; Jagadeesh S. Moodera, a senior research scientist in the Department of Physics; and senior authors Frances Ross, TDK Professor in DMSE; and Luqiao Liu, an associate professor in EECS, and a member of the Research Laboratory of Electronics; as well as others at the University of Chemistry and Technology in Prague. The paper appears today in Physical Review Letters.

Overcoming the limits

In an electronic device, silicon semiconductor transistors act like tiny light switches that turn a circuit on and off, or amplify weak signals in a communication system. They do this using a small input voltage.

But a fundamental physical limit of silicon semiconductors prevents a transistor from operating below a certain voltage, which hinders its energy efficiency.

To make more efficient electronics, researchers have spent decades working toward magnetic transistors that utilize electron spin to control the flow of electricity. Electron spin is a fundamental property that enables electrons to behave like tiny magnets.

So far, scientists have mostly been limited to using certain magnetic materials. These lack the favorable electronic properties of semiconductors, constraining device performance.

“In this work, we combine magnetism and semiconductor physics to realize useful spintronic devices,” Liu says.

The researchers replace the silicon in the surface layer of a transistor with chromium sulfur bromide, a two-dimensional material that acts as a magnetic semiconductor.

Due to the material’s structure, researchers can switch between two magnetic states very cleanly. This makes it ideal for use in a transistor that smoothly switches between “on” and “off.”

“One of the biggest challenges we faced was finding the right material. We tried many other materials that didn’t work,” Chou says.

They discovered that changing these magnetic states modifies the material’s electronic properties, enabling low-energy operation. And unlike many other 2D materials, chromium sulfur bromide remains stable in air.

To make a transistor, the researchers pattern electrodes onto a silicon substrate, then carefully align and transfer the 2D material on top. They use tape to pick up a tiny piece of material, only a few tens of nanometers thick, and place it onto the substrate.

“A lot of researchers will use solvents or glue to do the transfer, but transistors require a very clean surface. We eliminate all those risks by simplifying this step,” Chou says.

Leveraging magnetism

This lack of contamination enables their device to outperform existing magnetic transistors. Most others can only create a weak magnetic effect, changing the flow of current by a few percent or less. Their new transistor can switch or amplify the electric current by a factor of 10.

They use an external magnetic field to change the magnetic state of the material, switching the transistor using significantly less energy than would usually be required.

The material also allows them to control the magnetic states with electric current. This is important because engineers cannot apply magnetic fields to individual transistors in an electronic device. They need to control each one electrically.

The material’s magnetic properties could also enable transistors with built-in memory, simplifying the design of logic or memory circuits.

A typical memory device has a magnetic cell to store information and a transistor to read it out. Their method can combine both into one magnetic transistor.

“Now, not only are transistors turning on and off, they are also remembering information. And because we can switch the transistor with greater magnitude, the signal is much stronger so we can read out the information faster, and in a much more reliable way,” Liu says.

Building on this demonstration, the researchers plan to further study the use of electrical current to control the device. They are also working to make their method scalable so they can fabricate arrays of transistors.

This research was supported, in part, by the Semiconductor Research Corporation, the U.S. Defense Advanced Research Projects Agency (DARPA), the U.S. National Science Foundation (NSF), the U.S. Department of Energy, the U.S. Army Research Office, and the Czech Ministry of Education, Youth, and Sports. The work was partially carried out at the MIT.nano facilities.

The electrons that power our society flow left and right through the circuitry in our electronics, back and forth along the transmission lines that make up our power grid, and up and down to light up every floor of every building. But the electrons in newly discovered “moiré crystals” move in much stranger ways. They can move left and right, back and forth, or up and down in our three-dimensional world, but these electrons also act as if they can teleport in and out of a mysterious fourth dimension of space that is perpendicular to our perceivable reality. Physicists have found that this strange, newly discovered quantum behavior has nothing to do with the electrons themselves and everything to do with the strange material environment in which they live.

The electrons in moiré crystals leap into a fourth dimension through a process called “quantum tunneling.” While a soccer ball sitting at the bottom of a hill will stay put until someone retrieves it, a quantum particle in a valley can jump out all on its own. Quantum tunneling may seem magical to us, but it is quite commonplace in the microscopic quantum world, on the length scales of atoms. Quantum tunneling is also important on larger length scales, particularly in large superconducting circuits that underlie an emerging landscape of quantum technology, as recognized by the 2025 Nobel Prize in Physics. 

However, quantum tunneling in moiré crystals is different, in that once an electron tunnels, physicists have now measured that it acts as if it had tunneled into a completely different world and come back again, as if it had been transported through a fourth “synthetic” dimension.

In a paper published recently in the journal Nature, a team of MIT researchers realize a long-anticipated scalable technique for producing high-quality moiré materials as moiré crystals, overcoming a materials bottleneck for next-generation electronic applications. In addition, the electrons in these crystals act as if they can teleport through a fourth dimension of space, unlocking a realistic materials approach for realizing numerous theoretical predictions of higher-dimensional superconductivity and higher-dimensional topological properties in the laboratory.

The study’s co-lead authors are Kevin Nuckolls, a Pappalardo postdoc in physics at MIT, and Nisarga Paul PhD ’25, and the study’s corresponding author is Joe Checkelsky, professor of physics at MIT. In addition, the study’s MIT co-authors include Alan Chen, Filippo Gaggioli, Joshua Wakefield, and Liang Fu, along with collaborators at Harvard University, Toho University, and the National High Magnetic Field Laboratory.

Crystal perfection

To make a moiré material, physicists first start with atomically thin two-dimensional (2D) materials, like the thinnest sheets of carbon known as graphene. Moiré materials can be created by combining individual sheets of the same 2D material and twisting them back and forth with respect to one another. Moiré materials can also be created by combining two different 2D materials that are very similar, but not quite the same, which ensures that they can never perfectly match one another even when carefully aligned. Both of these methods create intricate interference patterns where the individual layers of moiré materials are nearly aligned in some areas and visibly misaligned in others. Physicists call these patterns “moiré superlattices,” named after historical French fabrics that show similarly beautiful patterns generated by overlaying two different threading patterns.

For more than a decade, moiré materials have completely reshaped how physicists design and control quantum material properties, and the physics labs at MIT have been the hotbed of transformative discoveries in this ever-growing research field. Pablo Jarillo-Herrero, the Cecil and Ida Green Professor of Physics at MIT, and Raymond Ashoori, professor of physics at MIT, were early adopters of new techniques for fabricating moiré materials. Together in 2014, their labs discovered that electrons in moiré materials made from graphene and the 2D material boron nitride live in an intricate quantum fractal known as “Hofstadter’s butterfly.” In 2018, Jarillo-Herrero’s lab discovered that moiré materials made from twisting two sheets of graphene were fertile grounds for unconventional superconductivity that, by some metrics, is one of the strongest superconductors ever discovered. Long Ju, the Lawrence C. and Sarah W. Biedenharn Associate Professor of Physics, and his lab discovered in 2024 that moiré materials made from multilayer graphene and boron nitride cause electrons to split apart into fractional pieces, a quantum phenomenon previously thought to be exclusively confined to extremely high magnetic fields, but now realized without the need for a magnetic field.

Common across all of these experiments, and those performed around the world, were the tireless efforts of students and postdocs in carefully assembling moiré material devices by hand, one at a time. To make a moiré material device, 2D materials like graphene are peeled using Scotch tape from rock-like crystals, such as graphite. Then, sticky polymer films and microscopes enable researchers to pick up different 2D materials one by one with a precise sequence of twist angles. Finally, these stacks of 2D materials are etched into individual devices that allow researchers to investigate their properties in the lab.

In their new study, Joe Checkelsky and his lab have discovered a new technique for generating moiré materials that skips over all of these laborious steps. Their new method takes an entirely different approach, and it’s one that can assemble moiré materials by the tens of thousands. Instead of assembling samples one by one and layer by layer, Checkelsky and his lab have found new chemical synthesis routes that enlist Mother Nature’s help to grow “moiré crystals” with high-quality moiré superlattices built into each of their layers. By analogy, if one were to think of previous generations of moiré materials like two stacked sheets of paper with different line spacings, Checkelsky has figured out how to generate entire libraries of encyclopedias whose odd-numbered pages and even-numbered pages have two different line spacings.

“It feels incredible for our team to have made this materials discovery, particularly at MIT,” says Nuckolls, co-lead author on the work. “Moiré materials have become a central focus of quantum materials research today in large part because of the work of our colleagues just down the hallway.”

In the end, it turns out that nature is by far the best at assembling moiré materials when given the right tools. The MIT team discovered that naturally grown moiré materials are nearly perfect and highly reproducible. This offers a long-anticipated proof-of-concept demonstration of a potentially scalable route to using moiré materials in next-generation electronics. Although there are many more obstacles to be overcome to transform these fundamental science results into usable technology, the team has demonstrated a crucial first step in the right direction.

4D in 4K

After discovering how to grow and manipulate moiré superlattices in moiré crystals, the team began to investigate their properties. Initially, the team found that the metallic properties of these materials were surprisingly complicated, but they soon shifted their perspective to think from a higher-dimensional point of view, an idea inspired by theoretical proposals made roughly half a century ago. To peer into this prospective four-dimensional quantum world, the team performed detailed studies of the electronic and magnetic properties of moiré crystals at very large magnetic fields. The electrons in common metals move in tight circular orbits when placed in a magnetic field. However, something very special happens when they move in moiré crystals with two different interfering lattices. This interference generates a moiré superlattice that is mathematically equivalent to an emergent four-dimensional “superspace” lattice. Guided by this new 4D superspace lattice, the team discovered that these electrons could now move through this fourth dimension when their motion aligns to the direction where the two competing lattices interfere the most.

“Metaphorically, our measurements uncover ‘shadows’ of emergent 4D landscape upon which the electrons live,” says Nuckolls. “By carefully analyzing these 3D silhouettes from different angles and perspectives, our measurement reconstructs the 4D landscape that guides electrons in moiré crystals.”

Although this extra synthetic dimension is fictitious and the electrons in moiré crystals are actually still stuck in our 3D reality, they simulate a four-dimensional quantum world so closely that the measured properties of moiré crystals appear as if the researchers had actually performed their experiments in 4D. It seems like moiré crystals aren’t particularly bothered by whether the fourth dimension is fictitious and synthetic or if it’s real. It’s all the same to them.

“Mathematically, the equations describing the electron dynamics in these crystals are four-dimensional,” says co-lead author Nisarga Paul. “The electrons propagate in the synthetic dimension just as they do in our world’s three physical dimensions. It’s hard to detect this motion, but one of the striking realizations was that a magnetic field can reveal fingerprints of this synthetic dimension in experimentally measurable electronic properties known as quantum oscillations.”

Going forward, the team will explore how a wide variety of material properties might benefit from extra synthetic dimensions, which now could be within reach of realization.

“It’s fascinating to consider what may be possible next,” Checkelsky says. “There are long-standing theoretical predictions for higher-dimensional conductors and superconductors, for example — materials of this type may offer a new platform to examine these experimentally in the laboratory.”

This research was supported, in part, by the Gordon and Betty Moore Foundation, the U.S. Department of Energy Office of Science, the U.S. Office of Naval Research, the U.S. Army Research Office, U.S. Air Force Office of Scientific Research, MIT Pappalardo Fellowships in Physics, the Swiss National Science Foundation, and the U.S. National Science Foundation. 

For the past three summers, MIT master’s students and recently graduated planners have collaborated with cities and community organizations to advance climate, infrastructure, and economic development initiatives. They’re known as the Freedom Summer Fellows, participants in an impact-driven program launched in 2023 by the MIT Department of Urban Studies and Planning (DUSP), an expression of the department’s commitment to equal opportunity and experiential learning. 

Over the course of eight to 10 weeks, fellows are immersed in the real stakes and challenges of projects that involve navigating a network of interconnected causes, competing agendas, a range of stakeholders, and rapidly changing circumstances. Host organizations define discrete tasks and provide ongoing supervision, while fellows develop actionable tools and materials designed to empower organizations in the long term — from policy research and grant application strategies to navigate funding, to analytical tools and implementation frameworks to ensure informed and streamlined project management. 

“You can’t teach planning today without grappling with how policy actually unfolds within communities; under pressure, with limited resources, and with multiple conflicting interests,” says Phillip Thompson, professor of urban planning at MIT and former New York City deputy mayor for strategic policy initiatives under Mayor Bill de Blasio. “The Freedom Summer Fellowship is about capacity building through cooperative learning — a knowledge exchange intended to have lasting positive results for communities, while equipping planners with critical experience as they embark on their careers.”

From classroom to communities

The fellowship emerged from Bills and Billions, a DUSP Independent Activities Period course taught by Thompson and Elisabeth Reynolds, professor of the practice at MIT and former special assistant to President Joe Biden for manufacturing and economic development. The course examines U.S. federal policy and its intersection with local economic development, labor markets, and the infrastructure of industry, energy, and the built environment more broadly.  

“We were at an inflection point,” says Reynolds, speaking of her return to MIT in fall 2022 after serving at the National Economic Council. “There was a real sense of urgency about the wave of new legislation and funding around clean energy, infrastructure, and reindustrialization, and much of the investment and work in these areas continues today. It’s a very dynamic time for cities and states, with significant experimentation and innovative strategies — a perfect environment for MIT graduate students and recent grads.”  

Securing federal funding is typically dependent on competitive grants requiring technical, financial, and community planning that many local governments and nonprofits are not equipped for. “While much funding to localities has since been cut, the momentum for change is still there,” says Thompson. “The incentives put forward by the Inflation Reduction Act encouraged localities and communities to initiate their own clean energy projects, and there’s a continued recognition that climate change is going to take a movement from the bottom up.”

At a time when the U.S. is experiencing a paradigm shift in policy — characterized by challenges to a free-market economy and global trade, renewed investment in industrial strategy, and the lifting of environmental and other regulations — the fellowship offers a way to support the planning and implementation of equitable development strategies and to redirect resources where they are needed most.

From placements to professional practice

Since 2023, 31 Freedom Summer Fellows have collaborated with 19 host organizations, and contributed to more than $100 million in state, federal, and philanthropic grant applications, including a successful $3 million EPA Climate Pollution Reduction grant for Hawaii. Fellows have helped convene more than 3,500 community members and have produced dozens of planning tools, including implementation maps, technical tools, and dashboards that support equitable project design and production. Collaborations have inspired the focus of graduate theses produced as client reports for hosts, and in several cases fellows have extended their positions to full-time roles. 

For Sara Jex MCP ’25, her 2024 Freedom Summer Fellowship became a direct pathway from graduate study to professional practice. She was placed with the Site Readiness Fund for Good Jobs in Cleveland, Ohio, an organization working to transform brownfields and disinvested industrial sites into engines of inclusive economic growth.

“Much of my work that summer involved developing an EPA Community Change Grant application for a proposed industrial district spanning over 350 acres — 200 of which we’re looking to reactivate,” says Jex. “So, it’s a transformative project that will bring in new jobs, but there are also major challenges that come with industrial place-making, especially given the proximity to residential neighborhoods. In Rust Belt cities, there’s a history of industrial disinvestment leading to job loss, population decline, and environmental injustices. We don’t want to repeat the harms of the past — we want to create something better.”

To support equitable development strategies for the industrial corridor, Jex helped to prepare technical tools mapping the effects of development on home values, seeking to identify a balance of growth, affordability, and resident benefit. She also evaluated wealth-building strategies such as land trusts and mixed-income neighborhood trusts, offering recommendations for community ownership of land holdings.

“Our vision for the project is not just about bringing in new businesses and creating new jobs,” says Jex, “it’s also about going beyond job creation to create lasting benefit for communities surrounding the sites.”

Jex continued working with Site Readiness Fund for Good Jobs during her second year at MIT and now holds a full-time role at the organization. “The Freedom Summer Fellowship gave me a platform to start building my planning career,” she reflects. “It was eye-opening to be in a cohort of other students doing similar work across the country. The insights from our weekly meetings have stayed with me since graduating — we were able to share perspectives on the challenges we were facing from multiple different contexts, and that brought a new dimension to the learning process.”

Redefining resilience

For Deena Darby, an MIT master’s student with a background in architecture and public art, her 2025 Freedom Summer Fellowship offered a way to bridge creative practice with structural change. Working with the LA84 Foundation and the Ubuntu Climate Initiative in Los Angeles, Darby focused on neighborhood-based resilience in the context of the 2025 wildfires and the upcoming 2028 Olympics.

“My decision to apply to do a master’s in city planning at MIT was informed by the projects I had been working on in Harlem, the Bronx, Brooklyn, and other cities, including Philadelphia and Detroit. Much of that work involved community engagement work when producing public art at an architectural scale, but I kept feeling that residents deserved more than an art piece at the end of a project.” 

During the fellowship, Darby contributed to asset mapping across six neighborhoods, developed case studies on resilience hubs, and helped shape strategies that tied climate adaptation to culture, play, and community ownership. Her immersion in the lived experience of those neighborhoods — visiting sites, meeting organizers, and participating in local coalitions — was crucial to her development of strategic recommendations for decentralized infrastructure, cultural arts cohorts, and neighborhood-based resilience festivals.

“Resilience is often narrowly framed around climate,” Darby reflects. “But what we were really redefining was economic resilience, social resilience, and the ability of communities to tell their own stories.” 

Darby’s fellowship experience has led to her thesis project, working with the residents of a historically Black neighborhood in her hometown of Savannah, Georgia, who are experiencing displacement. “Coming from an architecture and planning background, my instinct is to ask, How can we frame these issues in terms of cultural preservation and community-based policy development and implementation?” says Darby. “How can we manage change, with the goal of benefiting present residents as well as honoring those who have lived here in the past?”

For Darby, gaining practical understanding of the inseparability of planning and policy has been key to shaping her approach to navigating the educational opportunities at MIT. “In a higher-education context, you’ll often find policy housed separately from planning. But the moment you’re working in situ, it doesn’t make sense to separate the two. For me, the fellowship was a bridge between two often-siloed disciplines.”

Reassessing expertise

“Impact at MIT is typically associated with technological breakthroughs,” says Reynolds. “But much of MIT’s work can make a huge difference when applied in the near term, on the ground. At DUSP, we’re all about bringing theory and practice together, about the interrelation of communities, infrastructure, policy, and how that maps out in the built environment. We can bring expertise and knowledge into the field tomorrow, into places that can immediately benefit from the collaboration.” 

Initial funding for the fellowship at MIT was provided by the MIT Climate Project, in addition to national foundations. Faculty are exploring ways to expand and increase the number of student placements, further embedding relationships between MIT and cities across the United States. There are also discussions about sharing the model with other institutions, including historically Black colleges and international collaborators. 

“We’re just starting these conversations with other institutions, but it’s the model of engaged, experiential, cooperative learning that matters,” says Thompson. “It’s clear that the experts aren’t necessarily those who have read a lot of books about planning or design, but those who are embedded within communities, trying to figure out these challenges from the inside.”

The planner might not be the primary expert — but they are the ones who guide decisions that shape the futures of communities. The Freedom Summer Fellowship is about fostering a culture of urban planning in which those decisions are centered upon the lived experience of stakeholders. An approach to practice in which — as Jex put it, reflecting on her experience in Cleveland: “Planners are the people who make decisions about how cities shape access to opportunity.”

Applications for the 2026 Freedom Summer Fellowships are being accepted now through April 7. 

Here’s a fossil of a 150-million year old fish that choked to death on a belemnite rostrum: the hard, internal shell of an extinct, squid-like animal.

Original paper.

As usual, you can also use this squid post to talk about the security stories in the news that I haven’t covered.

Blog moderation policy.

The MIT James M. and Cathleen D. Stone Center on Inequality and Shaping the Future of Work recently hosted a half-day symposium at the Institute on “Why Wealth Inequality Matters.”

Three panel discussions convened experts from economics, philosophy, sociology, and political science to explore the origins, mechanisms, and political consequences of wealth inequality.

Richard Locke, John C Head III Dean of the MIT Sloan School of Management, welcomed attendees to the symposium, emphasizing how the event reflects MIT’s commitments to interdisciplinary collaboration and to addressing “society's most pressing issues.”

Here are three key takeaways from the afternoon’s panels.

When wealth buys political influence and legal immunity, democracy is threatened

Hélène Landemore of Yale University argued that wealth inequality isn’t inherently problematic, but becomes dangerous when wealth offers disproportionate influence in other spheres, including political power.

Wojciech Kopczuk of Columbia University echoed this, emphasizing that wealth is a complicated and often ambiguous measure of inequality. Wealth reflects institutional contexts — for example, weak safety nets drive precautionary saving. Still, he agreed that wealth is a relevant metric at the very top, where it correlates with political capture and corporate power.

Landemore explained that when the wealthy dominate policy discussions, “some groups are systematically disbelieved or ignored, and the result is policy failure.” For example, French carbon taxes disproportionately burdened working-class people who were more dependent on cars, which led to the yellow vests protests.

Elizabeth Anderson of the University of Michigan extended this point to corporate power, warning that extreme concentration gives powerful firms de facto immunity from the rule of law — the wealthiest companies can hire hundreds of lawyers to swamp the legal system.

To counteract these negative consequences of high inequality, Oren Cass of American Compass argued that strengthening worker power is key. Redistribution, he said, is a way to improve living standards, but “it is not a solution to the kinds of problems that actually plague democratic capitalism.”

The roots of the racial wealth gap are so deep that equal opportunity alone won’t close it

Ellora Derenoncourt of Princeton University explained that in the United States today, the wealth gap between Black and white Americans is 6:1. In other words, for every dollar of wealth held by an average white American, the average Black American holds about $0.17. She noted that this racial wealth gap has largely remained unchanged for the past 50 years.

“Even if we were to equalize differences in wealth accumulating opportunities — equal savings rates, equal capital gains rates going forward — we’re still hundreds of years away from convergence,” she explained, due to the magnitude of the original gap.

Alexandra Killewald of the University of Michigan added that the racial wealth gap is actively rebuilt each generation through unequal schools, unequal pay, and unequal access to homeownership.

“The past matters, but it’s not just about the past,” she explained. Even if a massive reparations plan were implemented, “if we just let things go on as they are, we will start to recreate inequality from Day 1.”

High inequality and authoritarianism reinforce each other

Daron Acemoglu of MIT described how increasing inequality goes hand-in-hand with the weakening of democracy: “Once inequality starts building up, it also naturally erodes democracies’ claim for legitimacy.”

High inequality, he argued, is both a cause and an effect of liberal democracy failing to deliver on its promise of shared prosperity. This failure, in turn, weakens public support for democracy.

Building on this argument, Sheri Berman of Barnard College examined why economically disadvantaged voters in the United States and Europe have increasingly voted for right-wing populist parties, despite holding economically progressive views.

She described how center-left parties have transformed since the late 20th century, converging with the right on economic policy (embracing free trade and market deregulation) while moving left on social and cultural issues. As a result, she argued, working-class and rural voters no longer saw center-left parties as champions of their economic interests, or as reflecting their social and cultural preferences.

David Yang of Harvard University explained that once authoritarianism takes hold, regimes continue to produce inequality. For example, non-democratic regimes are most responsive not to the average citizen, but to whoever poses the greatest threat to regime survival. In China, this tends to be the wealthier urban population capable of organizing large-scale collective action.

Today, there are 94 nuclear reactors operating in the United States, more than in any other country in the world, and these units collectively provide nearly 20 percent of the nation’s electricity. That is a major accomplishment, according to Dean Price, but he believes that our country needs much more out of nuclear energy, especially at a moment when alternatives to fossil fuel-based power plants are desperately being sought. He became a nuclear engineer for this very reason — to make sure that nuclear technology is up to the task of delivering in this time of considerable need.

“Nuclear energy has been a tremendous part of our nation’s energy infrastructure for the past 60 years, and the number of people who maintain that infrastructure is incredibly small,” says Price, an MIT assistant professor in the Department of Nuclear Science and Engineering (NSE), as well as the Atlantic Richfield Career Development Professor in Energy Studies. “By becoming a nuclear engineer, you become one of a select number of people responsible for carbon-free energy generation in the United States.” 

That was a mission he was eager to take part in, and the goals he set for himself were far from modest: He wanted to help design and usher in a new class of nuclear reactors, building on the safety, economics, and reliability of the existing nuclear fleet.

Price has never wavered from this objective, and he’s only found encouragement along the way. The nuclear engineering community, he says, “is small, close-knit, and very welcoming. Once you get into it, most people are not inclined to do anything else.”

Illuminating the relationships between physical processes

In his first research project as an undergraduate at the University of Illinois Urbana at Champaign, Price studied the safety of the steel and concrete casks used to store spent reactor fuel rods after they’ve cooled off in tanks of water, typically for several years. His analysis indicated that this storage method was quite safe, although the question as to what should ultimately be done with these fuel casks, in terms of long-term disposal, remains open in this country.

After starting graduate studies at the University of Michigan in 2020, Price took up a different line of research that he’s still engaged in today. That area of study, called multiphysics modeling, involves looking at various physical processes going on in the core of a nuclear reactor to see how they interact — an alternative to studying these processes one at a time.

One key process, neutronics, concerns how neutrons buzz around in the reactor core causing nuclear fission, which is what generates the power. A second process, called thermal hydraulics, involves cooling the reactor to extract the heat generated by neutrons. A multiphysics simulation, analyzing how these two processes interact, could show how the heat carried away as the reactor produces power affects the behavior of neutrons, because the hotter the fuel is, the less likely it is to cause fission.

“If you ever want to change your power level, or do anything with the reactor, the temperature of the fuel is a critical input that you need to know,” says Price. “Multiphysics modeling allows us to correlate the fission neutronics processes with a thermal property, temperature. That, in turn, can help us predict how the reactor will behave under different conditions.”

Multiphysics modeling for light water reactors, which are the ones operating today with capacities on the order of 1,000 megawatts, are pretty well established, Prices says. But methods for modeling advanced reactors — small modular reactors (SMRs with capacities ranging from around 20 to 300 MW) and microreactors (rated at 1 to 20 MW) — are far less advanced. Only a very small number of these reactors are operating today, but Price is focusing his efforts on them because of their potential to produce power more cheaply and more safely, along with their greater flexibility in power and size.   

Although multiphysics simulations have supplied the nuclear community with a wealth of information, they can require supercomputers to solve, or find approximate solutions to, coupled and extremely difficult nonlinear equations. In the hopes of greatly reducing the computational burden, Price is actively exploring artificial intelligence approaches that could provide similar answers while bypassing those burdensome equations altogether. That has been a central theme of his research agenda since he joined the MIT faculty in September 2025.

A crucial role for artificial intelligence

What artificial intelligence and machine-learning methods, in particular, are good at is finding patterns concealed within data, such as correlations between variables critical to the functioning of a nuclear plant. For example, Price says, “if you tell me the power level of your reactor, it [AI] could tell you what the fuel temperature is and even tell you the 3-dimensional temperature distribution in your core.” And if this can be done without solving any complicated differential equations, computational costs could be greatly reduced.

Price is investigating several applications where AI may be especially useful, such as helping with the design of novel kinds of reactors. “We could then rely on the safety frameworks developed over the past 50 years to carry out a safety analysis of the proposed design,” he says. “In this way, AI will not be directly interfacing with anything that is safety-critical.” As he sees it, AI’s role would be to augment established procedures, rather than replacing them, helping to fill in existing gaps in knowledge.

When a machine-learning model is given a sufficient amount of data to learn from, it can help us better understand the relationship between key physical processes — again without having to solve nonlinear differential equations. 

“By really pinning down those relationships, we can make better design decisions in the early stages,” Price says. “And when that technology is developed and deployed, AI can help us make more intelligent control decisions that will enable us to operate our reactors in a safer and more economical way.”

Giving back to the community that nurtured him

Simply put, one of his chief goals is to bring the benefits of AI to the nuclear industry, and he views the possibilities as vast and largely untapped. Price also believes that he is well-positioned as a professor at MIT to bring us closer to the nuclear future that he envisions. As he sees it, he’s working not only to develop the next generation of reactors, but also to help prepare the next generation of leaders in the field.

Price became acquainted with some prospective members of that “next generation” in a design course he co-taught last fall with Curtis Smith, the KEPCO Professor of the Practice of Nuclear Science and Engineering. For Price, that introduction lasted just a few months, but it was long enough for him to discover that MIT students are exceptionally motivated, hard-working, and capable. Not surprisingly, those happen to be the same qualities he’s hoping to find in the students that join his research team.

Price vividly recalls the support he received when taking his first, tentative steps in this field. Now that he’s moved up the ranks from undergraduate to professor, and acquired a substantial body of knowledge along the way, he wants his students “to experience that same feeling that I had upon entering the field.” Beyond his specific goals for improving the design and operation of nuclear reactors, Price says, “I hope to perpetuate the same fun and healthy environment that made me love nuclear engineering in the first place.”

While the very public fight continues between the Department of Defense and Anthropic over whether the government can punish a company for refusing to allow its technology to be used for mass surveillance, another branch of the U.S. government is quietly working to ensure that this dispute will never happen again. How? By rewriting government procurement rules.

Using procurement -- meaning, the processes by which governments acquire goods and services-- to accomplish policy goals is a time-honored and often appropriate strategy. The government literally expresses its politics and priorities by deciding where and how it spends its money. To that end, governments can and should give our tax dollars to companies and projects that serve the public interest, such as open-source software development, interoperability, or right to repair. And they should withhold those dollars from those that don’t, like shady contractors with inadequate security systems .

New proposed rules from the principal agency in charge of acquiring goods, property and services for the federal government, the General Services Administration, are supposed to be primarily an effort to implement one policy priority: promoting steering government funds toward “ideologically neutral” American AI innovation But the new guidelines do far more than that.

As explained in comments filed today with our partners at the Center for Democracy and Technology, the Protect Democracy Project, and the Electronic Privacy Information Center, the GSA’s guidelines include broad provisions that would make AI tools less safe and less useful. If finally adopted, these provisions would become standard components of every federal contract. You can read the full comments here.

The most egregious example is a requirement that contractors and government service providers must license their AI systems to the government for “all lawful purposes.” Given the government’s loose interpretations of the law, ability to find loopholes to surveil you, and willingness to do illegal spying, we need serious and proactive legal restrictions to prevent it from gobbling up all the personally data it can acquire and using even routine bureaucratic data for punitive ends.

Relatedly, the draft rules require that “AI System(s) must not refuse to produce data outputs or conduct analyses based on the Contractor’s or Service Provider’s discretionary policies.” In other words, if a company’s safety guardrails might prevent responding to a government request, the company must disable those guardrails. Given widespread public concerns about AI safety, it seems misguided, at best, to limit safeguards a company deems necessary.

There are myriad other problems with the draft rules, such as technologically incoherent “anti-Woke” requirements. But the overarching problem is clear: much of this proposal would not serve the overall public interest in using American tax dollars to promote privacy, safety, and responsible technological innovation. The GSA should start over.

Note they are also about implementing "anti-woke" tech which is even more stupid. I rewrote to allude to it but really that's a whole other blog post

You’re invited on a journey inside the privacy battles that shaped the internet. EFF’s Executive Director Cindy Cohn has tangled with the feds, fought for your data security, and argued before judges to protect our access to science and knowledge on the internet.

Join Cindy at two events in Washingtion, D.C. on April 13 and 14 discussing her new book: Privacy's Defender: My Thirty-Year Fight Against Digital Surveillance, on sale now. All proceeds from the book benefit EFF. Find the full event details below, and RSVP to let us know if you can make it.

April 13 - With Gigi Sohn at Busboys & Poets

Join American Association of Public Broadband (AAPB) Executive Director Gigi Sohn, in conversation with EFF Executive Director Cindy Cohn for a discussion about Cindy's work, her new book, and what we're all wondering: Can have private conversations if we live our lives online?

Privacy's Defender at Busboys & Poets
Busboys & Poets - 14th & V
2021 14th St NW, Washington, DC 20009
Monday, April 13, 2026
6:30 pm to 8:30 pm

Register Now

April 14 - With Women in Security and Privacy (WISP)

Join Women in Security and Privacy (WISP) and EFF for a conversation featuring American University Senior Professorial Lecturer Chelsea Horne and EFF Executive Director Cindy Cohn as they dive into data security, Federal access to data, and your digital rights. 

Privacy's Defender with WISP
True Reformer Building - Lankford Auditorium
1200 U St NW, Washington, DC 20009
Tuesday, April 14, 2026
6:00 pm to 8:30 pm

REGISTER NOW

"Privacy’s Defender is a compelling account of a life well lived and an inspiring call to action for the next generation of civil liberties champions."

~Edward Snowden, whistleblower; author of Permanent Record

Can't make it? Look for Cindy at a city (or web connection) near you! Find the latest tour dates on the Privacy’s Defender hub or follow EFF for more.

Part memoir and part legal history for the general reader, Privacy’s Defender is a compelling testament to just how much privacy and free expression matter in our efforts to combat authoritarianism, grow democracy, and strengthen human rights. Thank you for being a part of that fight.

Want to support the cause and get a copy of the new book? New or renewing EFF members can preorder one as their annual gift!

WebinarTV searches the internet for public Zoom invites, joins the meetings, secretly records them, and publishes (alternate link) the recordings. It doesn’t use the Zoom record feature, so Zoom can’t do anything about it.

As oil prices spike, governments are slashing fuel use and eyeing renewables — threatening to erode global demand for fossil energy.

The Trump administration is silent on its plans. Democrats urged renewal and warned about workers "risking their health and their lives."

Stardust Solutions released safety principles as part of its effort to assuage concerns over the role of commercial interests in blocking the sun.

Though they failed, Republican proposals rolling back requirements for renewable energy and electric school buses drew bipartisan support.

“Billions and billions of dollars have to flow into grid upgradation, battery storage, and so on,” said the president of Eversource Capital.

The French oil giant and the Emirati renewable firm will share costs for solar, wind and battery projects in countries from Kazakhstan to Indonesia and Japan.

Norway, with its thousands of dams, is often called Europe’s biggest battery. But months of dry weather have slashed energy exports.

Since 2022, policies implemented under her leadership have reduced forest loss by more than 50 percent.

Hydrogen sits at the center of some of the world’s most important industrial processes, but its production still comes with a heavy environmental cost. Today, most hydrogen is produced through high-emissions processes like steam methane reforming and coal gasification.

But hydrogen can also be made by splitting water molecules using renewable electricity, eliminating fossil fuel emissions and other toxic byproducts. Such “green hydrogen” is made by running an electric current through water in an electrolyzer.

Green hydrogen won’t scale through decarbonization alone. It also has to be cost-competitive with the traditional methods of production.

1s1 Energy thinks it has the technology to finally make green hydrogen go mainstream. The company says its boron-based membrane material unlocks previously unachievable performance and durability in electrolyzers.

In tests with partners, 1s1 says, electrolyzers with its membranes needed just 70 percent of the energy to produce each kilogram of hydrogen, compared to incumbent devices.

“Green hydrogen has been a hard industry to have success in so far,” acknowledges 1s1 co-founder Dan Sobek ’88, SM ’92, PhD ’97. “The difference with us is we’ve done very targeted customer discovery. We have a very strong value proposition that’s not just about decarbonization. We have a pipeline of potential customers that see around a 60 percent reduction in operating costs with our technology. That’s a nice point of entry.”

Although 1s1 is focused on hydrogen production now, its technology could also be used in fuel cells and solid-state batteries, and to extract critical metals from mining waste. The company is beginning trials in some of those applications, and it is working with a large materials company to scale up production of its membranes for hydrogen production.

“We’re at an inflection point for the company,” Sobek says. “The plan is, by 2030, to have a solid business in several segments: electrolyzers, mineral extraction, and in collaborations with several large companies. But right now, we have to be judicious and focused.”

Improving electrolyzers

Sobek was born and raised in Argentina, but he also grew up at MIT over the course of three degrees and more than a decade. He first studied aeronautics and astronautics at MIT, then jumped to mechanical engineering as a graduate student, then moved to the Department of Electrical Engineering and Computer Science, where he worked under PhD advisors and MIT professors Martha Gray and Stephen Senturia. His thesis focused on a technique for quickly measuring optical properties of large numbers of biological cells.

“A lot of my learnings around microfabrication and materials chemistry ended up being really relevant for 1s1,” Sobek says. “A class that was very important to me was taught by Professor Amar Bose. I was a teaching assistant for him for a couple of semesters, and that had an incredible influence on my thinking.”

Following graduation, Sobek worked in microelectronics and microfluidics before founding his own company, Zymera, in 2004. The company developed deep-tissue imaging technology for detecting cancer and other serious diseases.

Around 2013, Sobek started talking to his Zymera co-founder, Sukanta Bhattacharyya, about making electrolysis more efficient, focusing on “proton exchange membrane” electrolyzers. Such electrolyzers employ a large amount of electricity to split water into hydrogen and oxygen ions. At their center is a membrane that can lose efficiency through voltage resistance.

On top of the efficiency challenge, electricity is often more expensive than fossil fuels in many parts of the world. Traditional hydrogen production also has the benefit of existing infrastructure, making it that much more difficult for green hydrogen production to scale.

Sobek and Bhattacharyya knew the most important part of such electrolyzers is their proton-conducting membrane, which shuttles hydrogen ions from the anode to the cathode in the electrolyzer’s electrochemical cell.

“I asked Sukanta how we could improve the efficiency and durability of that element,” Sobek recalls. “He gave me a one-word answer: boron.”

Boron can be given a negative charge, which makes hydrogen ions, or protons, bond to it more quickly. The hydrogen ions can then be filtered through the membrane and released as they move through the cell. Boron-based materials are also more stable and resistant to corrosion, further improving the long-term performance of electrolyzers.

The company was officially founded in late 2019. After years of development, today 1s1 attaches a chemically tailored version of boron onto polymer materials to create its membranes for exchanging protons.

“These are first-of-a-kind membranes with stable and durable, super-acid proton exchange groups that do not poison catalysts,” Sobek says.

Tiny membranes with big impact

In 2021, the U.S. Department of Energy set a goal for proton exchange membrane electrolysis to achieve 77 percent electrical efficiency by 2031. Sobek says 1s1 is already reaching that milestone in tests.

“It’s not just the technology, but the way we’re applying it,” Sobek says, “We’re making hydrogen viable for use in the production of different industrial chemicals.”

1s1 is currently conducting pilots with partners, including an electrical utility owned by a large steel company in Brazil. The company is also actively exploring other applications for its technology. Last year, 1s1 announced a project to produce green ammonia with the company Nitrofix through joint funding from the U.S. Department of Energy and the Israeli Ministry of Energy and Infrastructure. It’s also working with a large mine in Brazil to extract a material called niobium, which is useful for high-strength steel as well as fast-charging batteries. A similar process could even be used to extract gold.

“We can do that without using harsh chemicals, because the standard processes used to extract niobium and gold use extremely strong acids at high temperatures or extremely toxic chemicals,” Sobek says. “It’s gratifying for me because my home country of Argentina has had a lot of problems with the use of toxic chemicals to extract gold. We’re trying to enable low-cost, responsible mining.”

As 1s1 scales its membrane technology, Sobek says the goal is to deploy wherever the technology can improve processes.

“We have a large number of potential customers because this technology is really foundational,” Sobek says. “Creating high-impact technologies is always fun.”

Nature Climate Change, Published online: 03 April 2026; doi:10.1038/s41558-026-02621-0

Global modelling shows that integrating photovoltaics in the façades of buildings could deliver substantial electricity generation, building energy savings and emissions reductions — and highlights an underexplored opportunity for urban energy transition and climate mitigation.

Nature Climate Change, Published online: 03 April 2026; doi:10.1038/s41558-026-02612-1

Carbon pricing can be a cost-effective way to cut carbon dioxide emissions, but only if it is politically sustainable. Two recent papers document how carbon pricing can create winners and losers, while also showing how these shortcomings can be addressed by careful policy design.