Fast Facts
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Breakthrough Measurement: MIT physicists have successfully measured the quantum geometry of electrons in solids for the first time, moving beyond theoretical inferences to actual data.
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New Analytical Technique: The team utilized angle-resolved photoemission spectroscopy (ARPES) to assess the quantum properties of materials, exemplified by their study of a kagome metal.
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Collaboration Across Borders: The study highlights the importance of international cooperation among theorists and experimentalists, significantly enhanced due to the unique circumstances of the COVID-19 pandemic.
- Broader Implications: This research lays the groundwork for exploring a wider range of quantum materials, potentially impacting advancements in quantum computing and advanced electronic technologies.
MIT Physicists Measure Quantum Geometry for the First Time
MIT physicists have achieved a significant breakthrough. They measured the quantum geometry of electrons in solids for the first time. This work represents a leap forward in our understanding of how electrons behave in crystalline materials.
Traditionally, scientists could only measure the energy and velocity of electrons. They inferred quantum geometry through theoretical models. Now, researchers can directly observe this geometric property. “We’ve essentially developed a blueprint for obtaining information that couldn’t be obtained before,” says Riccardo Comin. He leads the research as the Class of 1947 Career Development Associate Professor of Physics at MIT.
The findings appear in the Nov. 25 issue of Nature Physics. Mingu Kang, a former MIT graduate student, contributed as the first author of the paper. He emphasized that this new measurement technique could apply to various quantum materials, not limited to their current study.
Quantum physics often seems strange. Electrons can behave as both particles and waves. Their behavior is described by what scientists call a wave function. Comin explains that this wave function represents a surface in a three-dimensional space. In simpler terms, some wave functions are like a smooth ball. Others, more complex, resemble a Mobius strip.
Until now, researchers could only theorize about the quantum geometry of these materials. As more quantum materials are discovered, understanding their geometry becomes essential. This knowledge could lead to advancements in areas such as quantum computing and next-generation electronics.
The team used a technique known as angle-resolved photoemission spectroscopy (ARPES) for their measurements. This method allowed them to clarify the quantum geometry of a specific material called a kagome metal, which they studied previously.
Additionally, their success stemmed from close collaboration with theorists and experimentalists. Kang’s ability to work with South Korean theorists during the pandemic was crucial. Comin also faced unique challenges. While conducting experiments at the Italian Light Source Elettra, he initially worked alone when Kang was unable to attend due to a positive COVID-19 test.
This research involved numerous contributors, showcasing a broad network of collaboration. Support came from many institutions and foundations in the U.S. and abroad, highlighting the global effort behind this scientific advancement.
As researchers explore the quantum properties of materials further, this breakthrough paves the way for new technological developments. It opens doors to understand and manipulate quantum materials effectively, potentially revolutionizing fields like electronics and magnetic devices. With renewed insights into quantum geometry, MIT physicists are poised to lead the future of technology innovation.
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https://news.mit.edu/2025/physicists-measure-quantum-geometry-first-time-0113
