Berlin 2024 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 51: Topological Semimetals II

TT 51.2: Talk

Wednesday, March 20, 2024, 15:15–15:30, H 3007

Quantum oscillations from interface Fermi arcs — Adam Yanis Chaou, •Vatsal Dwivedi, and Maxim Breitkreiz — Freie Universität Berlin

Fermi arcs --- the characteristic boundary signatures of Weyl semimetals --- generically also appear at a weakly coupled interface between two Weyl semimetals. We study the magnetotransport across such an interface in presence of a magnetic field normal to the interface, and describe signatures of these interface modes in the quantum oscillations. These oscillations stem from a momentum-space analog of Aharonov-Bohm interference of electrons moving along various branches of the interface Fermi arcs. The localization of the interface modes along the transport direction manifests in a strong field-angle anisotropy of the oscillations, which distinguishes them from conventional Shubnikov-de Haas oscillations and makes them identifiable even in complex quantum oscillation spectra.

Keywords: Weyl semimetal; Fermi arcs; Quantum oscillations; Magnetotransport