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Large oscillatory thermal hall effect in kagome metals
Dechen Zhang1, Kuan-Wen Chen1, Guoxin Zheng1
1Department of Physics, University of Michigan, Ann Arbor, MI, USA.
Nature Communications
|July 23, 2024
Summary
Researchers observed a significant oscillatory thermal Hall effect in correlated Kagome metals, revealing quantum oscillations (QOs) and a 180-degree phase change. This finding offers new insights into exotic quantum materials.
Area of Science:
- Condensed Matter Physics
- Quantum Materials Science
Background:
- The thermal Hall effect probes exotic quantum matter's ground state, sparking debate on fermionic vs. bosonic origins.
- Quantum oscillations (QOs) in Kitaev spin liquids suggest Landau level quantization, typically associated with fermionic thermal transport.
- Detecting QOs in the thermal Hall effect is challenging.
Purpose of the Study:
- To investigate the oscillatory thermal Hall effect in correlated Kagome metals.
- To explore the characteristics and implications of QOs in thermal transport properties.
- To determine if thermal Hall QOs can provide deeper insights than electrical Hall QOs.
Main Methods:
- Experimental observation of the thermal Hall effect in correlated Kagome metals.
- Analysis of quantum oscillations (QOs) in the thermal Hall signal.
- Comparison of thermal Hall QOs with electrical Hall QOs.
Main Results:
- Observation of a large oscillatory thermal Hall effect.
- Detection of a 180-degree phase change in the oscillation, identified as a key feature of QOs.
- Profound QOs in the thermal Hall channel, significantly violating the Wiedemann-Franz law.
Conclusions:
- The oscillatory thermal Hall effect is a powerful new probe for correlated quantum materials.
- The observed phase flip is crucial for identifying QOs in thermal transport.
- The violation of the Wiedemann-Franz law by thermal Hall QOs highlights unique quantum phenomena.
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