Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 57: Topology: Poster
TT 57.6: Poster
Wednesday, March 20, 2024, 15:00–18:00, Poster E
Nonlinear transport in the topological semimetal ZrTe5 — •Yongjian Wang1, Henry F. Legg2,3, Thomas Bömerich2, Jinhong Park2, Sebastian Biesenkamp1, Alexey Taskin1, Markus Braden1, Achim Rosch2, and Yoichi Ando1 — 1Institute of Physics II, University of Cologne, D-50937 Köln, Germany — 2Institute for Theoretical Physics, University of Cologne, D-50937 Köln, Germany — 3Department of Physics, University of Basel, CH-4056 Basel, Switzerland
The topological semimetal ZrTe5 has been a focus of significant interest in recent years. Here we report our discovery that ZrTe5 crystals in proximity to a topological quantum phase transition present gigantic magnetochiral anisotropy (MCA) [1] and non-ohmic behavior [2]. The MCA in ZrTe5 is the largest ever observed to date as a bulk property, which is explained by the combination of very low carrier density, inhomogeneities, and a torus-shaped Fermi surface induced by breaking of inversion symmetry [1]. Besides, in ZrTe5 samples with extremely low carrier density, pronounced nonlinear current-voltage characteristics were observed when the current and magnetic field are both along the crystallographic a-axis. The non-ohmic behavior in the ZrTe5 having torus Fermi surface is likely due to the combined effect of ultra-flat bands and charge puddles, the former shows up as a result of Landau quantization when the magnetic field is applied in the torus plane [2].
[1] Y. Wang et al., PRL 128, 176602 (2022)
[2] Y. Wang et al., PRL 131, 146602 (2023)