MIT Researchers Measure Quantum Geometry of Electrons in Solid Materials
A new study has allowed physicists from the Massachusetts Institute of Technology (MIT) and collaborators to measure the quantum geometry of electrons in solids. The research provides insights into the shape and behaviour of electrons within crystalline materials at a quantum level. Quantum geometry, which had previously been limited to theoretical predictions, has now been directly observed, enabling unprecedented avenues for manipulating quantum material properties, according to the study.
New Pathways for Quantum Material Research
The study was published in Nature Physics on November 25. As described by Riccardo Comin, Class of 1947 Career Development Associate Professor of Physics at MIT, the achievement is a major advancement in quantum material science. In an interview with MIT’s Materials Research Laboratory, Comin highlighted that their team has developed a blueprint for obtaining completely new information about quantum systems. The methodology used can potentially be applied to a wide range of quantum materials beyond the one tested in this study.
Technical Innovations Enable Direct Measurement
The research employed angle-resolved photoemission spectroscopy (ARPES), a technique previously used by Comin and his colleagues to examine quantum properties. The team adapted ARPES to directly measure quantum geometry in a material known as kagome metal, which features a lattice structure with unique electronic properties. Mingu Kang, first author of the paper and a Kavli Postdoctoral Fellow at Cornell University, noted that this measurement became possible due to collaboration between experimentalists and theorists from multiple institutions, including South Korea during the pandemic.
These experiences underscore the collaborative and resourceful efforts involved in realising this scientific breakthrough. This advancement offers new possibilities in understanding the quantum behaviour of materials, paving the way for innovations in computing, electronics, and magnetic technologies, as reported in Nature Physics.
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Nuclear physicists have detected the radioactive disintegration of a rare isotope of astatine for the first time. This shows that the heaviest element found in nature may be modified a lot, maybe even destroyed, in a way that scientists didn’t predict. That oddball radioactive decay with 85 protons and 103 neutrons is almost (but not quite) a nuclear species that we would call stable. The finding was made by researchers at the University of Jyväskylä in Finland, and it’s a major development for nuclear physics. It describes something that just shouldn’t be and then shows us what the forces are that make for heavy atomic structures.
Rare Proton Decay in 188At Sheds Light on Extreme Nuclear Shapes and Stability Limits
As per a report published in Nature Communications on May 29, 2025, the isotope was produced using a fusion-evaporation reaction that entailed the irradiation of a natural silver target with strontium-84 ions. The exotic nucleus, 188 At, has a pronouncedly prolate form (of a ”watermelon” type) generated by the neutron and proton normal and attractive interaction in the inner shells of heavy nuclei experienced as a projectile in our case study.
Henna Kokkonen, the doctoral researcher who made the discovery, has mentioned that the proton emitted allows an unstable nucleus to progress towards stability by getting rid of a proton. The 190 At isotope was found by Kokkonen with the investigation of rare decay in the heavy nucleus, the rare interaction in the binding energy of the proton, and presumably a tendency change in the heavy atom region.
The team of the theory and experiment workshop pointed out the importance of exploring new decay modes and testing predictive models at the extremes of the periodic table. They also talked about how technology has improved in making and studying isotopes with short lifetimes.
Isotope discoveries of this scale remain rare in modern nuclear physics. Kokkonen expressed pride in contributing to a global effort that deepens our understanding of atomic structure. Each such finding helps refine our knowledge of nuclear forces, elemental formation, and the fundamental limits of matter. The breakthrough underscores how even after a century of nuclear science, the field continues to yield surprises from the smallest building blocks of the universe.
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