Large Oscillatory Thermal Hall Effect in Kagome Metals

Abstract

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.

3 figures, accepted version

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Cited by in corpus (4)

• AV${}_3$Sb${}_5$ kagome superconductors: a review with transport measurements
• Observation of Anomalous Thermal Hall Effect in a Kagome Superconductor
• Itinerant and topological excitations in a honeycomb spiral spin liquid candidate
• Electron-electron and electron-phonon collision cross sections in CsV3Sb5