Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 66: Poster Session Transport

TT 66.2: Poster

Donnerstag, 19. März 2020, 15:00–19:00, P2/EG

Kondo impurities in two dimensional Dirac semimetals — •Michael Turaev and Johann Kroha — Physikalisches Institut, Universität Bonn, 53115 Bonn, Germany

In this work we study the effects of Kondo as well as static spin impurities on the surface of a three dimensional topological Kondo insulator, which is a Dirac semimetal. Recently there have been scanning tunneling spectroscopy measurements (STM) [1] of the surface state of Gd-substituted SmB6. Gd has a half filled 4f shell, constituting to a static spin, and a single electron in the 5d shell that can be described as a Kondo impurity. The static spin impurity opens up a local gap and suppresses the local density of states whereas the Kondo impurity can lead to a Kondo peak in the density of states. A realistic theoretical description of the STM experiments requires both of these effects to be taken into account. We use T-matrix and non crossing approximation techniques to analyze a position dependent local density of states that is measured in [1].

[1] L. Jiao et al., Sci. Adv. 4, eaau4886 (2018)

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