通过三阶非线性探究kagome材料CsV3Sb5中的反常对称性破缺
Probing the anomalous symmetry-breaking in kagome material CsV3Sb5 via third-order nonlinearity
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中文总结 AI 辅助
本研究通过三阶非线性输运测量，在kagome材料CsV3Sb5中观测到室温稳定的巨大非线性响应，并揭示其由量子几何和外在散射共同主导，为探测反常对称性破缺提供了新方法。
中文摘要 AI 辅助
kagome材料因其独特的几何结构和丰富的非常规物理现象，迅速成为凝聚态物理的研究前沿。在kagome AV3Sb5（A = K, Rb, Cs）家族中，电荷有序态表现出一个显著特征，即反常对称性破缺，这与电子能带结构的拓扑性质密切相关。在此，我们报道了kagome材料CsV3Sb5中三阶非线性纵向和霍尔响应，这些响应在室温下稳定存在。值得注意的是，非线性响应在电荷密度波（约77 K）有序和反常对称性破缺（约39 K）态以下表现出显著增强。标度分析表明，三阶非线性输运由量子几何贡献和外在散射共同主导。本研究实现了巨大的三阶非线性响应，并提供了一种检测CsV3Sb5中反常对称性破缺的独特方法。
英文摘要
The kagome material has rapidly established itself as a research frontier in condensed matter physics, owing to its distinctive geometric structure and the rich array of unconventional physical phenomena. In the kagome AV3Sb5 (A = K, Rb, Cs) family, the charge-ordered state exhibits a remarkable characteristic, i.e., anomalous symmetry-breaking, which is tied to the topological nature of the electronic band structure. Here, we report the third-order nonlinear longitudinal and Hall responses that persist stably up to room temperature in the kagome material CsV3Sb5. Notably, the nonlinear responses demonstrate significant enhancement below the charge density wave (~ 77 K) order and anomalous symmetry-breaking (~ 39 K) state. The scaling analysis indicates that the third-order nonlinear transport is governed jointly by quantum geometric contribution and extrinsic scattering. This study realizes a giant third-order nonlinear response and provides a distinct method to detect anomalous symmetry-breaking in CsV3Sb5.
发表机构
- National Laboratory of Solid-State Microstructures, Collaborative Innovation Center of Advanced Microstructures, Jiangsu Physical Science Research Center, and School of Physics, Nanjing University（南京大学固体微结构物理国家重点实验室、先进微结构协同创新中心、江苏物理科学研究中心和物理学院）
- Institute of Atom Manufacturing, Nanjing University（南京大学原子制造研究所）
- Jiangsu Provincial Key Laboratory of Atomic Level Manufacturing, Nanjing Institute of Atomic Scale Manufacturing（江苏省原子级制造重点实验室、南京原子尺度制造研究所）
- School of Physics and Electronic Information, Jiangsu Second Normal University（江苏第二师范学院物理与电子信息学院）
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