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NSBP member, Nadya Mason, leads group to isolate bound states in graphene-superconductor junctions


Professor Nadya Mason's group at the University of Illinois-Urbana Champaign has documented the first observations of some unusual physics when two prominent electric materials are connected: superconductors and graphene. Electrons in superconductors are conducted in electron-electron pairs. In normal conducting materials electrons are conducted as a stream of single electrons. But when a normal conducting material is sandwiched between two layers of a superconducting material, the electrons are conducted in via Andreev bound states (ABS), special electron-hole pairs. Mason's group was able to directly observe ABS by using graphene quantum dots as the normal conducting material, which confines the ABS energies to discrete levels. more

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