SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 59: Poster Session: Topology
TT 59.10: Poster
Donnerstag, 30. März 2023, 15:00–18:00, P2/OG4
Photo-thermal imaging of ZrTe5 in the quasi-quantized Hall regime — •Erica Warth Pérez Arias1, Rafal Wawrzyńczak1, Stansilaw Galeski1, Johannes Gooth2, Claudia Felser1, and Fabian Menges1 — 1Max Planck Institute for Chemical Physics of Solids, Germany — 2University of Bonn, Germany
ZrTe5 has recently gained attention due to various intriguing experimental observations including the chiral magnetic effect [1] and the quasi-quantized 3D quantum Hall effect [2]. However, it remains challenging to probe the characteristic features of gapless surface and edge states experimentally. Addressing this challenge, we devised an optoelectronic detection scheme based on cryogenic magneto-optical laser scanning microscopy. The technique relies on a global electrical read-out of locally-induced currents, and contrasts previous all-optical studies of photogalvanic effects. We characterized ZrTe5 single crystals with this approach and visualized rich spatial patterns of photo-induced transport as function of temperature and magnetic field. Remarkably, current maps obtained in the quasi-quantized Hall regime display long-range photoresponse over mm-distances and oscillations in magnetic field, hinting towards charge movement of ambient carriers in the system [3] driven by the photo-thermal effect [4] and the external magnetic field.
[1] Q. Li et.al., Nat. Phys. 12, 550-554 (2016)
[2] S. Galeski et.al., Nat. Commun. 12, 3197 (2021)
[3] J. C. W. Song et.al., Phys. Rev. B 90, 075415 (2014)
[4] Y. Wang et.al., arXiv:2203.17176 [cond-mat.mtrl-sci] (2022)