Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 41: Topological Semimetals
TT 41.6: Vortrag
Mittwoch, 11. März 2026, 11:00–11:15, HSZ/0103
Novel difference-frequency quantum oscillations in MoSi2 — •Ivan Volkau1, Nico Huber2, Louw Feenstra1, Andreas Bauer1,4, Christian Pfleiderer1,3,4, and Marc A. Wilde1,4 — 1Technical University of Munich (TUM) — 2Cornell University — 3MCQST, Munich — 4TUM Zentrum für Quantum Engineering
Recently, we established temperature-stable quantum oscillations of the quasiparticle lifetime (QPLOs) in CoSi (space group P213) [1]. QPLOs may shed new light on scattering processes in materials, since they arise in transport properties at finite coupling between semi-classical Onsager orbits. MoSi2 (space group I4/mmm) exhibits a difference frequency in its SdH spectra, composed of distinct low- and high-temperature (LT and HT) components. The temperature stability and the absence in thermodynamic properties of the HT component is consistent with the theoretical framework of QPLOs [2]. Conversely, the LT component cannot be attributed to QPLOs, as it is observed in both SdH and dHvA measurements. Furthermore, its phase shift of approximately 0.75(10)π relative to the HT component is inconsistent with standard non-Onsager mechanisms, such as magnetic breakdown, magnetic interaction, or chemical potential oscillations [3]. In this work, we present a detailed study of quantum oscillations in MoSi2, analyzing the interplay between these components to clarify the nature of the scattering mechanisms involved.
[1] Huber et al., Nature 621, 276 (2023)
[2] Leeb et al., PRB 108, 054202 (2023)
[3] Leeb et al., APR, Vl4, Is4 2400134 (2025)
Keywords: MoSi2; quasiparticle lifetime oscillations; quantum oscillations