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MIT team decodes quantum geometry in kagome metal for the first time | We know a lot about electrons in terms of their energy, nature, and movement. However, their quantum geometry has remained a puzzle.
Experiments that directly probe the quantum geometric tensor in solids have not been reported. Now, the quantum metric and spin Berry curvature—dual components of the quantum geometric tensor—have been simultaneously measured in reciprocal space.
Establishing this momentum- and energy-resolved spectroscopic probe of the QGT is poised to significantly advance our understanding of quantum geometric responses in a wide range of crystalline systems. Very efficient spin polarization analysis (VESPA): new exchange scattering-based setup for spin-resolved ARPES at APE-NFFA beamline at Elettra. was supported by STC Center for Integrated Quantum Materials, NSF grant DMR-1231319, Heising-Simons Physics Research Fellow Program and Tsinghua Education Foundation.
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