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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, 05/2021, Volume: 12, Issue: 1Journal Article
Abstract 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 5 . 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 5 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 5 electronic structure and its Dirac-type semi-metallic character.
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