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TT: Fachverband Tiefe Temperaturen
TT 38: Topological Semimetals I
TT 38.5: Vortrag
Mittwoch, 20. März 2024, 10:30–10:45, H 3010
Quantum oscillations of the quasiparticle lifetime due to interorbit coupling — •Louw Feenstra1, 2, Nico Huber1, Michael Schmidlechner1, Andreas Bauer1,4, Christian Pfleiderer1,3,4, and Marc A. Wilde1,4 — 1Technical University of Munich — 2Ludwig-Maximilians-Universität München — 3Munich Center for Quantum Science and Technology (MCQST) — 4TUM Zentrum für QuantumEngineering (ZQE)
A recent study on CoSi [1] revealed quantum oscillations with a frequency corresponding to the semi-classically forbidden difference between two quasiparticle orbit frequencies. These difference frequency oscillations persist up to temperatures at which their constituent frequencies are completely suppressed by thermal damping. The existence and temperature stability of these oscillations are explained by oscillations of the quasiparticle lifetime mediated by a non-linear interband coupling [2]. Here, we report on a detailed investigation of a related compound exhibiting the same phenomenology. Through angular and temperature dependent measurements of the Shubnikov-de Haas effect, a difference frequency is clearly identified and its remarkable temperature stability confirmed. In contrast to CoSi, the constituent frequencies originate from two extremal orbits on an anisotropic Fermi surface pocket arising from a single band. We demonstrate tuning of the difference frequency by rotation of the applied magnetic field.
[1] N. Huber et al., Nature 621 (2023) 276
[2] V. Leeb, J. Knolle, Phys. Rev. B 108 (2023) 054202
Keywords: Quantum oscillations; Shubnikov-de Haas; Quasiparticle lifetime