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
Department of Physics, University of Michigan, Ann Arbor, MI, USA.
CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, Department of Physics, University of Science and Technology of China, Hefei, Anhui, China.
Nat Commun. 2024 Jul 23;15(1):6224. doi: 10.1038/s41467-024-50336-7.
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.
热霍尔效应最近为奇异量子物质的基态提供了有趣的探测手段。这些横向热霍尔信号的观测引发了关于这些现象的费米子起源与玻色子起源的争论。最近关于 Kitaev 自旋液体中量子振荡（QOs）的报告指出了一种可能的解决方案。朗道能级量子化很可能只捕捉到费米子热输运效应。然而，热霍尔效应中的量子振荡通常很难检测到。在这项工作中，我们报告了对关联 Kagome 金属中大幅振荡热霍尔效应的观测。我们检测到振荡的 180 度相变，并证明这种相位翻转是热输运性质中量子振荡的一个基本特征。更重要的是，热霍尔通道中的量子振荡比电霍尔通道中的更为显著，这强烈违反了量子振荡的维德曼 - 弗兰兹（WF）定律。这一结果表明振荡热霍尔效应是探测关联量子材料的有力手段。
