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TT: Fachverband Tiefe Temperaturen
TT 38: Topological Semimetals I
TT 38.4: Vortrag
Mittwoch, 20. März 2024, 10:15–10:30, H 3010
Quantum Oscillations in AlPt: Experimental Validation and Insights into the Electronic Structures — Nico Huber1, •Simon Röder1, Andre Deyerling1, Ivan Volkau1, Andreas Bauer1,2, Fabian Jochum1, Christian Pfleiderer1,2,3, and Marc A. Wilde1 — 1Technical University of Munich (TUM) — 2TUM Zentrum für Quantum Engineering (ZQE) — 3Munich Center for Quantum Science and Technology (MCQST)
B20 compounds, including AlPt, CoSi and PdGa, show a variety of interesting physical phenomena attributed to their complex electronic structure [1,2]. They host topologically non-trivial multifold crossing points and nodal planes [3] that influence the physical responses. AlPt exhibits a strong spin-orbit coupling predicted to have a distinct impact on its properties. A precise knowledge of the Fermi surface is key for their understanding and to date only limited information is available in the literature [4]. In this work, we report on previously undetected quantum oscillation frequencies in AlPt. We probed the de Haas-van Alphen effect using cantilever-based torque magnetometry in magnetic fields up to 18T and at temperatures down to 1.5K. We compare our findings with first-principle calculations and confirm the predicted band structure by matching the experimentally detected frequencies, their angular dependence and effective masses to extremal orbits on the Fermi surface.
[1] Huber et al., Nature 621 (2023) 276 (2023)
[2] Schroeter et al., Nat. Phys. 15 (2019) 759
[3] Wilde et al., Nature 594 (2021) 374
[4] Saini et.al., Phys. Rev. B 106 (2022) 125126
Keywords: B20 systems; nodal planes; quantum oscillations