Quantum-metric-induced giant and reversible nonreciprocal transport phenomena in chiral loop-current phases of kagome metals

Rina Tazai, Youichi Yamakawa, Takahiro Morimoto, Hiroshi Kontani
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Abstract

Rich spontaneous symmetry-breaking phenomena with nontrivial quantum geometric properties in metals represent central issues in condensed matter physics. The emergence of chiral loop-current order, accompanied by time-reversal symmetry (TRS) breaking in various kagome metals, has garnered significant attention as a novel quantum topological state. Particularly noteworthy is the giant electrical magnetochiral anisotropy (eMChA) in CsV3Sb5 [Guo et al, Nature 611, 461 (2022)], which provides compelling evidence of TRS and inversion-symmetry breaking. However, the underlying essence of this observation has remained obscured due to the lack of theoretical understanding. Here, we identify that the chiral loop-current induces substantial and switchable eMChA in kagome metals by taking account of the experimentally observed stripe charge-density-wave. The obtained eMChA coefficient is $\gamma_{eM}\propto M_{orb} \tau$, where $M_{orb}$ is the loop-current-induced orbital magnetization and $\tau$ is the lifetime of conduction electrons. Importantly, giant eMChA arises from the quantum metric (QM), which defines essential quantum phases of matter and their unique functionalities, including nonlinear effects. This effect is resonantly amplified in the loop-current phase, and the derived eMChA is switched by minute magnetic fields. This research elucidates the fundamental symmetry breaking in kagome metals and also sets the stage for investigating the QM-induced phenomena arising from electronic correlations.
手性环流相中量子计量诱导的巨型和可逆非互惠输运现象
金属中具有非难量子几何特性的丰富自发对称性破缺现象是凝聚态物理学的核心问题。作为一种新型量子拓扑态,手性环流秩序的出现,以及伴随着各种卡戈米金属中时间逆转对称性(TRS)的破缺,赢得了极大的关注。尤其值得注意的是 CsV3Sb5 中的巨型电磁手性各向异性(eMChA)[Guo 等,《自然》611, 461 (2022)],它提供了 TRS 和反转对称破缺的有力证据。在这里,我们通过考虑实验观察到的条纹电荷密度波,确定了手性环流在可戈米金属中诱导了大量可切换的 eMChA。得到的 eMChA 系数是$\gamma_{eM}\propto M_{orb}\tau$\其中,$M_{orb}$ 是环流诱导的轨道磁化,$\tau$ 是传导电子的寿命。重要的是,巨型 eMChA 来自量子度量(QM),它定义了物质的基本量子相及其独特功能,包括非线性效应。这种效应在环流阶段被共振放大,衍生出的 eMChA 可通过微小磁场进行切换。这项研究阐明了卡戈米金属中的基本对称性破缺,也为研究电子关联引起的QM诱导现象奠定了基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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