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Galeski, S; Ehmcke, T; Wawrzyńczak, R; Lozano, P M; Cho, K; Sharma, A; Das, S; Küster, F; Sessi, P; Brando, M; Küchler, R; Markou, A; König, M; Swekis, P; Felser, C; Sassa, Y; Li, Q; Gu, G; Zimmermann, M V; Ivashko, O; Gorbunov, D I; Zherlitsyn, S; Förster, T; Parkin, S S P; Wosnitza, J; Meng, T; Gooth, J
Nature communications, 2021-May-27, Letnik: 12, Številka: 1Journal Article
The quantum Hall effect (QHE) is traditionally considered to be a purely two-dimensional (2D) phenomenon. Recently, however, a three-dimensional (3D) version of the QHE was reported in the Dirac semimetal ZrTe . It was proposed to arise from a magnetic-field-driven Fermi surface instability, transforming the original 3D electron system into a stack of 2D sheets. Here, we report thermodynamic, spectroscopic, thermoelectric and charge transport measurements on such ZrTe samples. The measured properties: magnetization, ultrasound propagation, scanning tunneling spectroscopy, and Raman spectroscopy, show no signatures of a Fermi surface instability, consistent with in-field single crystal X-ray diffraction. Instead, a direct comparison of the experimental data with linear response calculations based on an effective 3D Dirac Hamiltonian suggests that the quasi-quantization of the observed Hall response emerges from the interplay of the intrinsic properties of the ZrTe electronic structure and its Dirac-type semi-metallic character.
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