Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Topological Semimetals II

TT 20.14: Vortrag

Montag, 12. März 2018, 18:30–18:45, A 053

Quantum oscillations in Weyl-II semimetals near magnetic breakdown — •Fabian Lambert¹, Johannes Knolle², and Ilya Eremin¹ — ¹Ruhr-Universität Bochum — ²Imperial College London

The band structure of a type-II Weyl semimetal has pairs of electron and hole pockets that coexist over a range of energies and touch at a topologically protected conical point. While it is known, that in this case tunneling effects will lead to what is called a magnetic breakdown, the existence of these pairs of pockets at the Fermi energy also has an impact on the quantum oscillations associated with the topological Fermi arcs that exist on the surface of these materials. We analyze the quantum oscillations for a tight-binding model describing both Weyl I and Weyl II semimetals concentrating on the large field regime. The surface Fermi arcs coxisting with bulk electron and hole pockets lead to new experimental signatures of the quantum oscillations, which will be crucial for their experimental identification.