Quantum geometry plays a key role in allowing a material known as twisted bilayer graphene (tBLG) to become a superconductor, according to new experiments by physicists at The Ohio State University, The University of Texas at Dallas, and the National Institute for Materials Science in Japan. The finding implies that the widely employed Bardeen–Cooper–Schrieffer (BCS) equations for superconductors need to be modified for materials like tBLG that have very slow-moving charges. It may also help provide new guiding principles in the search for new superconductors that operate at higher temperatures, say the researchers.
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