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22 juin 2017: 1 événement

séminaire

  • The anomalous de Haas-van Alphen effect and Excitons in a topological Kondo insulator

    Jeudi 22 juin 11:00-12:30 - Johannes Knolle - University of Cambridge

    The anomalous de Haas-van Alphen effect and Excitons in a topological Kondo insulator

    Résumé : The de Haas-van Alphen effect, describing oscillations of the magnetization as a function of magnetic field, is commonly assumed to be a definite sign for the presence of a Fermi surface (FS) in a metal. Here we show that, in contrast to this canonical situation, there can be quantum oscillations even for insulators of certain types. We draw connections to recent experiments on the topological Kondo insulator (TKI) candidate SmB6. In addition, we show that TKIs are susceptible to the formation of bound electron-hole pairs. These excitons can account for long-standing thermodynamic and recent transport anomalies in SmB6 which is crucial for the identification of bulk topological signatures.

    Lieu : salle 208a, aîle sud LPS, bât 510

    En savoir plus : The anomalous de Haas-van Alphen effect and Excitons in a topological Kondo insulator