Large oscillatory thermal hall effect in kagome metals

The thermal Hall effect recently provided intriguing probes to the ground state of exotic quantum matters. These observations of transverse thermal Hall signals lead to the debate on the fermionic versus bosonic origins of these phenomena. The recent report of quantum oscillations (QOs) in Kitaev sp...

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Bibliographic Details
Published in:Nature communications 2024-07, Vol.15 (1), p.6224-8, Article 6224
Main Authors: Zhang, Dechen, Chen, Kuan-Wen, Zheng, Guoxin, Yu, Fanghang, Shi, Mengzhu, Zhu, Yuan, Chan, Aaron, Jenkins, Kaila, Ying, Jianjun, Xiang, Ziji, Chen, Xianhui, Li, Lu
Format: Article
Language:English
Subjects:
639/301/119/995
639/766/119/2792/4128
Correlation
Electromagnetism
Heavy metals
Humanities and Social Sciences
Legal issues
multidisciplinary
Oscillations
Quantum Hall effect
Science
Science & Technology - Other Topics
Science (multidisciplinary)
Spin liquid
Transport properties
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Summary:The thermal Hall effect recently provided intriguing probes to the ground state of exotic quantum matters. These observations of transverse thermal Hall signals lead to the debate on the fermionic versus bosonic origins of these phenomena. The recent report of quantum oscillations (QOs) in Kitaev spin liquid points to a possible resolution. The Landau level quantization would most likely capture only the fermionic thermal transport effect. However, the QOs in the thermal Hall effect are generally hard to detect. In this work, we report the observation of a large oscillatory thermal Hall effect of correlated Kagome metals. We detect a 180-degree phase change of the oscillation and demonstrate the phase flip as an essential feature for QOs in the thermal transport properties. More importantly, the QOs in the thermal Hall channel are more profound than those in the electrical Hall channel, which strongly violates the Wiedemann–Franz (WF) law for QOs. This result presents the oscillatory thermal Hall effect as a powerful probe to the correlated quantum materials. Detection of quantum oscillations in thermal transport could shed light on the origin of thermal Hall effect in correlated materials but it is challenging. Here the authors report quantum oscillations in the thermal Hall effect in the kagome metal CsV 3 Sb 5 indicating strong violation of the Wiedemann–Franz law.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-024-50336-7