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  • richardmitnick 11:19 am on January 15, 2019 Permalink | Reply
    Tags: An effect that Einstein helped discover 100 years ago offers new insight into a puzzling magnetic phenomenon, , , , Magnetics, ,   

    From SLAC National Accelerator Lab: “An effect that Einstein helped discover 100 years ago offers new insight into a puzzling magnetic phenomenon” 

    From SLAC National Accelerator Lab

    January 14, 2019
    Ali Sundermier

    At SLAC’s Linac Coherent Light Source, the researchers blasted an iron sample with laser pulses to demagnetize it, then grazed the sample with X-rays, using the patterns formed when the X-rays scattered to uncover details of the process. (Gregory Stewart/SLAC National Accelerator Laboratory)

    Researchers from ETH Zürich in Switzerland used LCLS to show a link between ultrafast demagnetization and an effect that Einstein helped discover 100 years ago. (Dawn Harmer/SLAC National Accelerator Laboratory)

    Using an X-ray laser, researchers watched atoms rotate on the surface of a material that was demagnetized in millionths of a billionth of a second.

    More than 100 years ago, Albert Einstein and Wander Johannes de Haas discovered that when they used a magnetic field to flip the magnetic state of an iron bar dangling from a thread, the bar began to rotate.

    Now experiments at the Department of Energy’s SLAC National Accelerator Laboratory have seen for the first time what happens when magnetic materials are demagnetized at ultrafast speeds of millionths of a billionth of a second: The atoms on the surface of the material move, much like the iron bar did. The work, done at SLAC’s Linac Coherent Light Source (LCLS) X-ray laser, was published in Nature earlier this month.


    Christian Dornes, a scientist at ETH Zürich in Switzerland and one of the lead authors of the report, says this experiment shows how ultrafast demagnetization goes hand in hand with what’s known as the Einstein-de Haas effect, solving a longstanding mystery in the field.

    “I learned about these phenomena in my classes, but to actually see firsthand that the transfer of angular momentum actually makes something move mechanically is really cool,” Dornes says. “Being able to work on the atomic scale like this and see relatively directly what happens would have been a total dream for the great physicists of a hundred years ago.”

    Spinning sea of skaters

    At the atomic scale, a material owes its magnetism to its electrons. In strong magnets, the magnetism comes from a quantum property of electrons called spin. Although electron spin does not involve a literal rotation of the electron, the electron acts in some ways like a tiny spinning ball of charge. When most of the spins point in the same direction, like a sea of ice skaters pirouetting in unison, the material becomes magnetic.

    When the magnetization of the material is reversed with an external magnetic field, the synchronized dance of the skaters turns into a hectic frenzy, with dancers spinning in every direction. Their net angular momentum, which is a measure of their rotational motion, falls to zero as their spins cancel each other out. Since the material’s angular momentum must be conserved, it’s converted into mechanical rotation, as the Einstein-de Haas experiment demonstrated.

    Twist and shout

    In 1996, researchers discovered that zapping a magnetic material with an intense, super-fast laser pulse demagnetizes it nearly instantaneously, on a femtosecond time scale. It has been a challenge to understand what happens to angular momentum when this occurs.

    In this paper, the researchers used a new technique at LCLS combined with measurements done at ETH Zürich to link these two phenomena. They demonstrated that when a laser pulse initiates ultrafast demagnetization in a thin iron film, the change in angular momentum is quickly converted into an initial kick that leads to mechanical rotation of the atoms on the surface of the sample.

    At SLAC’s Linac Coherent Light Source, the researchers blasted an iron sample with laser pulses to demagnetize it, then grazed the sample with X-rays, using the patterns formed when the X-rays scattered to uncover details of the process. (Gregory Stewart/SLAC National Accelerator Laboratory)

    According to Dornes, one important takeaway from this experiment is that even though the effect is only apparent on the surface, it happens throughout the whole sample. As angular momentum is transferred through the material, the atoms in the bulk of the material try to twist but cancel each other out. It’s as if a crowd of people packed onto a train all tried to turn at the same time. Just as only the people on the fringe would have the freedom to move, only the atoms at the surface of the material are able to rotate.

    Scraping the surface

    In their experiment, the researchers blasted the iron film with laser pulses to initiate ultrafast demagnetization, then grazed it with intense X-rays at an angle so shallow that it was nearly parallel to the surface. They used the patterns formed when the X-rays scattered off the film to learn more about where angular momentum goes during this process.

    “Due to the shallow angle of the X-rays, our experiment was incredibly sensitive to movements along the surface of the material,” says Sanghoon Song, one of three SLAC scientists who were involved with the research. “This was key to seeing the mechanical motion.”

    To follow up on these results, the researchers will do further experiments at LCLS with more complicated samples to find out more precisely how quickly and directly the angular momentum escapes into the structure. What they learn will lead to better models of ultrafast demagnetization, which could help in the development of optically controlled devices for data storage.

    Steven Johnson, a scientist and professor at ETH Zürich and the Paul Scherrer Institute in Switzerland who co-led the study, says the group’s expertise in areas outside of magnetism allowed them to approach the problem from a different angle, better positioning them for success.

    “There have been numerous previous attempts by other groups to understand this, but they failed because they didn’t optimize their experiments to look for these tiny effects,” Johnson says. “They were swamped by other much larger effects, such as atomic movement due to laser heat. Our experiment was much more sensitive to the kind of motion that results from the angular momentum transfer.”

    LCLS is a DOE Office of Science user facility. This work was supported by NCCR Molecular Ultrafast Science and Technology, a research instrument of the Swiss National Science Foundation.

    See the full article here .

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    SLAC Campus
    SLAC is a multi-program laboratory exploring frontier questions in photon science, astrophysics, particle physics and accelerator research. Located in Menlo Park, California, SLAC is operated by Stanford University for the DOE’s Office of Science.

  • richardmitnick 2:50 pm on August 24, 2015 Permalink | Reply
    Tags: , , , Magnetics   

    From COSMOS: “Could buckyballs make any metal into a magnet?” 

    Cosmos Magazine bloc


    24 Aug 2015
    Viviane Richter

    A layer of carbon can bestow the powers of magnetism. Viviane Richter explains.

    A magnetic field: Magnets have become crucially important in the computer age, so researchers are seeking to learn how to magnetise metals without the help of rare Earth elements.Credit: Science Photo Library / Getty Images

    In a feat of modern day alchemy, scientists have successfully turned non-magnetic metals into magnets. Oscar Cespedes at the University of Leeds and his team published their magnetic recipe in Nature in August. The key ingredient? A dusting of carbon.

    “This is a new way of making magnets – it opens up a new field!” says Naresh Dalal from Florida State University, who also researches magnetic materials.

    Magnets are crucial in the age of big data. We’ve generated almost as much data in the past two years as during all of human history. To generate and store it, devices such as smartphones and computer hard drives use tiny, powerful magnets that store data as magnetic alignments – or “bits”. The magnets gain their strength from rare Earth elements such as neodymium. But extracting these elements is an intensive process, requiring vats of industrial solvents.

    To reduce that environmental price tag, scientists have been looking for an alternative way to create ultra-powerful magnets. And that involves going to the very source of magnetism – electrons.

    You can think of the electrons in an atom as behaving a bit like planets orbiting a Sun. They make their way around the atom’s nucleus while also spinning on their own axis. The spin can be clockwise or anti-clockwise, or “up” or “down”. As they spin, each electron generates its own tiny magnetic field.

    A block of metal becomes a magnet when most of its electrons spin in the same direction, combining their tiny magnetic fields. You can induce this alignment by holding another magnet close to the metal. But at room temperature only iron, cobalt and nickel retain the alignment after the magnet is removed. Electrons in other metals quickly fall back into their dishevelled spinning state – the interaction between their spins is not strong enough to keep the alignment intact.

    Cespedes and his team wondered if they could coax those obstinate electrons into aligning their spin – and staying there. For assistance they turned to buckminsterfullerene, or “buckyballs”, molecules of 60 carbon atoms shaped like a soccer ball.

    The spherical carbon molecule also known as a buckyball could help to magnetise metals.Credit: Science Picture Co. / Corbis

    Buckyballs are extremely stable – so stable some astronomers think they may have been what delivered carbon to Earth from space. Their electrons are trapped between the atoms of the “ball” leaving very few free on the surface. This electron-poor surface sucks up electrons from other sources like water in a sponge. Perhaps these electron sponges might also coax electrons to align their spins in one direction?

    To test that idea, the team took a non-magnetic wafer of copper, merely 20-atoms-thick, and pelted it with buckyballs until they’d built up a coating six layers thick. Then they popped this material in an ultra-sensitive magnetometer to see if the copper-carbon combination was magnetised.

    They measured a slight, but definite, magnetism from the metal. “OK, nobody is going to believe this”, thought Cespedes. “We’ll have to measure another 100 samples.” So they did, and the results were consistent. “This is the first universal method that you can apply to any metal to try and make it magnetic,” he says.

    Their copper magnet was 30 times weaker than iron, so it wouldn’t stick to your fridge. And the magnetism only lasted for a couple of weeks. While the team is still trying to work out the exact mechanism for how the buckyballs exert their effects, the team is confident they can make stronger magnets by tweaking the metal or changing the buckyball layer to other stable carbon-based molecules.

    Dalal says the discovery will put buckyballs on the data storage map, but other applications for these magnets are hard to predict. “A new method can lead to something we really can’t even imagine.”

    See the full article here.

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  • richardmitnick 5:08 pm on December 17, 2014 Permalink | Reply
    Tags: , , , Magnetics,   

    From LBL: “Switching to Spintronics” 

    Berkeley Logo

    Berkeley Lab

    December 17, 2014
    Lynn Yarris (510) 486-5375

    In a development that holds promise for future magnetic memory and logic devices, researchers with the U.S. Department of Energy (DOE)’s Lawrence Berkeley National Laboratory (Berkeley Lab) and Cornell University successfully used an electric field to reverse the magnetization direction in a multiferroic spintronic device at room temperature. This demonstration, which runs counter to conventional scientific wisdom, points a new way towards spintronics. and smaller, faster and cheaper ways of storing and processing data.

    Conceptual illustration of how magnetism is reversed (see compass) by the application of an electric field (blue dots) applied across gold capacitors. Blurring of compass needles under electric field represents two-step process. (Image courtesy of John Heron, Cornell)

    “Our work shows that 180-degree magnetization switching in the multiferroic bismuth ferrite can be achieved at room temperature with an external electric field when the kinetics of the switching involves a two-step process,” says Ramamoorthy Ramesh, Berkeley Lab’s Associate Laboratory Director for Energy Technologies, who led this research. “We exploited this multi-step switching process to demonstrate energy-efficient control of a spintronic device.”

    Ramesh, who also holds the Purnendu Chatterjee Endowed Chair in Energy Technologies at the University of California (UC) Berkeley, is the senior author of a paper describing this research in Nature. The paper is titled Deterministic switching of ferromagnetism at room temperature using an electric field. John Heron, now with Cornell University, is the lead and corresponding author. (See below for full list of co-authors).

    Ramamoorthy Ramesh is Berkeley Lab’s Associate Laboratory Director for Energy Technologies, a UC Berkeley professor, and a leading authority on multiferroics. (Photo by Roy Kaltschmidt)

    Multiferroics are materials in which unique combinations of electric and magnetic properties can simultaneously coexist. They are viewed as potential cornerstones in future data storage and processing devices because their magnetism can be controlled by an electric field rather than an electric current, a distinct advantage as Heron explains.

    “The electrical currents that today’s memory and logic devices rely on to generate a magnetic field are the primary source of power consumption and heating in these devices,” he says. “This has triggered significant interest in multiferroics for their potential to reduce energy consumption while also adding functionality to devices.”

    Nature, however, has imposed thermodynamic barriers and material symmetry constrains that theorists believed would prevent the reversal of magnetization in a multiferroic by an applied electric field. Earlier work by Ramesh and his group with bismuth ferrite, the only known thermodynamically stable room-temperature multiferroic, in which an electric field was used as on/off switch for magnetism, suggested that the kinetics of the switching process might be a way to overcome these barriers, something not considered in prior theoretical work.

    “Having made devices and done on/off switching with in-plane electric fields in the past, it was a natural extension to study what happens when an out-of-plane electric field is applied,” Ramesh says.

    Ramesh, Heron and their co-authors set up a theoretical study in which an out-of-plane electric field – meaning it ran perpendicular to the orientation of the sample – was applied to bismuth ferrite films. They discovered a two-step switching process that relies on ferroelectric polarization and the rotation of the oxygen octahedral.

    John Heron is the lead author of a Nature paper describing the switching of ferromagnetism at room temperature using an electric field.

    “The two-step switching process is key as it allows the octahedral rotation to couple to the polarization,” Heron says. “The oxygen octahedral rotation is also critical because it is the mechanism responsible for the ferromagnetism in bismuth ferrite. Rotation of the oxygen octahedral also allows us to couple bismuth ferrite to a good ferromagnet such as cobalt-iron for use in a spintronic device.”

    To demonstrate the potential technological applicability of their technique, Ramesh, Heron and their co-authors used heterostructures of bismuth ferrite and cobalt iron to fabricate a spin-valve, a spintronic device consisting of a non-magnetic material sandwiched between two ferromagnets whose electrical resistance can be readily changed. X-ray magnetic circular dichroism photoemission electron microscopy (XMCD-PEEM) images showed a clear correlation between magnetization switching and the switching from high-to-low electrical resistance in the spin-valve. The XMCD-PEEM measurements were completed at PEEM-3, an aberration corrected photoemission electron microscope at beamline 11.0.1 of Berkeley Lab’s Advanced Light Source.

    LBL Advanced Light Source
    LBL ALS interior

    “We also demonstrated that using an out-of-plane electric field to control the spin-valve consumed energy at a rate of about one order of magnitude lower than switching the device using a spin-polarized current,” Ramesh says.

    In addition to Ramesh and Heron, other co-authors of the Nature paper were James Bosse, Qing He, Ya Gao, Morgan Trassin, Linghan Ye, James Clarkson, Chen Wang, Jian Liu, Sayeef Salahuddin, Dan Ralph, Darrell Schlom, Jorge Iniguez and Bryan Huey.

    See the full article here.

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  • richardmitnick 9:35 am on June 20, 2014 Permalink | Reply
    Tags: , Magnetics,   

    from physicsworld.com: “Electrons’ magnetic interactions isolated at long last” 


    Jun 19, 2014
    Tushna Commissariat

    A measurement of the extremely weak magnetic interaction between two single electrons has been carried out by an international team of physicists. Using experimental techniques first developed for quantum-information and ion-trapping technologies, the team made its measurement despite the presence of magnetic noise, which is a million times stronger than the signal it was seeking. Apart from measuring magnetism at the shortest length scale thus far, the researchers say that their technique could be applied to other measurement scenarios where noise is a dominant factor, such as for quantum-error corrections.

    Since the 1920s, researchers have known that the electron possesses an intrinsic angular momentum and an associated magnetic moment – known as its spin magnetic moment. Essentially, each electron acts like a tiny, indivisible magnetic dipole that is affected by magnetic fields. Although researchers have accurately measured the magnetic field of an individual electron, the magnetic interactions between two electrons have proved much more difficult to observe. When two electrons are separated by a very small distance (atomic-scale separations), the magnetic interactions are at their strongest and should be easy to measure. However, in this scenario Pauli’s exclusion principle and Coulomb electrical repulsion dominate the interactions between the electrons, drowning out the magnetic interaction. While these two effects weaken as the electrons move further apart, so does the magnetic interaction, which is then almost completely obscured by ambient magnetic noise.

    Isolated interactions

    One way of coping with this noise is to completely isolate the electrons from the environment – a technique that is often employed in quantum-information processing. This is the concept that Shlomi Kotler, from the Weizmann Institute of Science, Israel, and colleagues adopted to make their exquisite measurements. Indeed, Kotler says that the team’s measurement was performed at a scale “which is quite exotic – two microns. It is the size of an E. coli bacteria”, meaning that “the most dominant process is not of force between the electrons but of noise”. He further explains that the main tool used by the team to make its measurement was that of “decoherence-free subspaces” – a quantum-computing technique where a system is completely decoupled from its environment to protect information.

    Kotler likens the difficulty of this measurement to trying to measure the size of a pea floating in the ocean, with huge waves of noise moving it erratically, across a distance of kilometres. While it would initially seem impossible to make the measurement (thanks to the pea’s constant movement), the trick would be to float alongside the pea. In that case, a wave would have the same effect on the pea and the observer, so that the effect of the waves would be inconsequential. In the researchers’ experiment, one electron is trying to sense the magnetic field of the other. “But that field is riding on top of magnetic noise in the lab, which is a million times bigger,” says Kolter. “The only way to make this measurement possible is to place the two electrons on an equal footing with respect to the ambient magnetic noise. This way, magnetic noise becomes irrelevant.”

    Photograph of the experimental set-up, including the trap Ions inside: the experimental set-up. No image credit.

    To do so, the team uses two strontium (88Sr+ ) ions, in a vacuum chamber at a fixed distance of 2 μm from one another, held using a Paul ion trap. Each ion has a single ground-state, spin-1/2 valence electron and no nuclear spin. Using lasers tuned to the atomic transition of the ions, the team manipulated the electrons and prepared them in an initial state where the north pole of one electron is facing the north pole of the other. Like a regular bar magnet, the like poles repel each other and would rotate, thereby interacting. But as the magnets in this case are electrons, quantum effects come into play and the electrons become entangled in what Kolter describes as “both a north–north and south–south facing state”.
    Elongated entanglement

    Even more surprising is that this naturally created entanglement lasts for 15 s – a surprisingly long time for a system to remain in a coherent, quantum state. After that time, the researchers use laser pulses to detect “whether their north poles are facing or anti-facing each other”. By varying the separation between the two ions, they were able to measure the strength of the magnetic interaction as a function of distance – confirming the expected inverse-cubic (1/d3) dependence of the interaction.

    Kolter told physicsworld.com that while the result itself was not surprising – current theories say that magnetism behaves similarly at all scales – it was how long the electrons were entangled for that was unexpected. “Our main surprise was the coherence – the fact that the electrons behaved quantum-mechanically for a ‘human-scale duration’ (15 s and more) and that the tiny forces of magnetism are still strong enough to entangle the two particles over this time. In many respects this is unprecedented.” Conventionally, quantum mechanics is thought to work for tiny systems at short time scales. The team’s system was rather large – 2 µm and so, almost macroscopic – and it still preserved the quantum-mechanical property of entanglement for an extremely long time.

    Kolter points out that, nearly 20 years ago, quantum-computation experiments adapted advanced spectroscopic tools to generate entanglement between massive particles, and spectroscopy has been a driving force in experimental quantum computing ever since. Now, Kolter’s research has turned this around by using quantum-computing tools to “do a very sensitive spectroscopy experiment. We believe that this trend will continue to be fruitful in the near future”, he says. Beyond validating the behaviour of the magnetic force at the micron scale, the team’s system could be used to set a bound on “anomalous spin forces” that might come into play beyond Standard Model physics. But it could also be generalized and applied to other scenarios, such as for quantum-error correction protocols.

    The research was published in Nature.

    See the full article here.

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  • richardmitnick 9:59 am on March 7, 2014 Permalink | Reply
    Tags: , , Magnetics, ,   

    From UC Berkeley: “Colored diamonds are a superconductor’s best friend” 

    UC Berkeley

    March 6, 2014
    Robert Sanders

    Flawed but colorful diamonds are among the most sensitive detectors of magnetic fields known today, allowing physicists to explore the minuscule magnetic fields in metals, exotic materials and even human tissue.

    Dmitry Budker and Ron Folman build ‘atom chips’ to probe the minuscule magnetic properties of high-temperature superconductors. Robert Sanders photo.

    University of California, Berkeley, physicist Dmitry Budker and his colleagues at Ben-Gurion University of the Negev in Israel and UCLA have now shown that these diamond sensors can measure the tiny magnetic fields in high-temperature superconductors, providing a new tool to probe these much ballyhooed but poorly understood materials.

    “Diamond sensors will give us measurements that will be useful in understanding the physics of high temperature superconductors, which, despite the fact that their discoverers won a 1987 Nobel Prize, are still not understood,” said Budker, a professor of physics and faculty scientist at Lawrence Berkeley National Laboratory.

    High-temperature superconductors are exotic mixes of materials like yttrium or bismuth that, when chilled to around 180 degrees Fahrenheit above absolute zero (-280ºF), lose all resistance to electricity, whereas low-temperature superconductors must be chilled to several degrees above absolute zero. When discovered 28 years ago, scientists predicted we would soon have room-temperature superconductors for lossless electrical transmission or magnetically levitated trains.

    It never happened.

    “The new probe may shed light on high-temperature superconductors and help theoreticians crack this open question,” said coauthor Ron Folman of Ben-Gurion University of the Negev, who is currently a Miller Visiting Professor at UC Berkeley. “With the help of this new sensor, we may be able to take a step forward.”

    Budker, Folman and their colleagues report their success in an article posted online Feb. 18 in the journal Physical Review B.

    Flawed but colorful

    Colorful diamonds, ranging from yellow and orange to purple, have been prized for millennia. Their color derives from flaws in the gem’s carbon structure: some of the carbon atoms have been replaced by an element, such as boron, that emits or absorbs a specific color of light.

    Once scientists learned how to create synthetic diamonds, they found that they could selectively alter a diamond’s optical properties by injecting impurities. In this experiment, Budker, Folman and their colleagues bombarded a synthetic diamond with nitrogen atoms to knock out carbon atoms, leaving holes in some places and nitrogen atoms in others. They then heated the crystal to force the holes, called vacancies, to move around and pair with nitrogen atoms, resulting in diamonds with so-called nitrogen-vacancy centers. For the negatively charged centers, the amount of light they re-emit when excited with light becomes very sensitive to magnetic fields, allowing them to be used as sensors that are read out by laser spectroscopy.

    Folman noted that color centers in diamonds have the unique property of exhibiting quantum behavior, whereas most other solids at room temperature do not.

    “This is quite surprising, and is part of the reason that these new sensors have such a high potential,” Folman said.

    Applications in homeland security?

    Technology visionaries are thinking about using nitrogen-vacancy centers to probe for cracks in metals, such as bridge structures or jet engine blades, for homeland security applications, as sensitive rotation sensors, and perhaps even as building blocks for quantum computers.

    The crystal lattice of a pure diamond is pure carbon (black balls), but when a nitrogen atom replaces one carbon and an adjacent carbon is kicked out, the ‘nitrogen-vacancy center’ becomes a sensitive magnetic field sensor.

    Budker, who works on sensitive magnetic field detectors, and Folman, who builds ‘atom chips’ to probe and manipulate atoms, focused in this work on using these magnetometers to study new materials.

    “These diamond sensors combine high sensitivity with the potential for high spatial resolution, and since they operate at higher temperatures than their competitors – superconducting quantum interference device, or SQUID, magnetometers – they turn out to be good for studying high temperature superconductors,” Budker said. “Although several techniques already exist for magnetic probing of superconducting materials, there is a need for new methods which will offer better performance.”

    The team used their diamond sensor to measure properties of a thin layer of yttrium barium copper oxide (YBCO), one of the two most popular types of high-temperatures superconductor. The Ben-Gurion group integrated the diamond sensor with the superconductor on one chip and used it to detect the transition from normal conductivity to superconductivity, when the material expels all magnetic fields. The sensor also detected tiny magnetic vortices, which appear and disappear as the material becomes superconducting and may be a key to understanding how these materials become superconducting at high temperatures.

    “Now that we have proved it is possible to probe high-temperatures superconductors, we plan to build more sensitive and higher-resolution sensors on a chip to study the structure of an individual magnetic vortex,” Folman said. “We hope to discover something new that cannot be seen with other technologies.”

    Researchers, including Budker and Folman, are attempting to solve other mysteries through magnetic sensing. For example, they are investigating networks of nerve cells by detecting the magnetic field each nerve cell pulse emits. In another project, they aim at detecting strange never-before-observed entities called axions through their effect on magnetic sensors.

    Coauthors include Amir Waxman, Yechezkel Schlussel and David Groswasser of Ben-Gurion University of the Negev, UC Berkeley Ph.D. graduate Victor Acosta, who is now at Google [x] in Mountain View, Calif., and former UC Berkeley post-doc Louis Bouchard, now a UCLA assistant professor of chemistry and biochemistry.

    The work was supported by the NATO Science for Peace program, AFOSR/DARPA QuASAR program, the National Science Foundation and UC Berkeley’s Miller Institute for Basic Research in Science.

    See the full article here.

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