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

Datum

27.07.2017

Zeit

14:00 - 15:00

Sprecher

Johannes Knolle

Zugehörigkeit

TCM Group, Cavendish Laboratory, University of Cambridge

Sprache

en

Hauptthema

Physik

Beschreibung

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 SmB$_6$. 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 SmB$_6$ which is crucial for the identification of bulk topological signatures.

Letztmalig verändert: 27.07.2017, 09:38:38