双圆光诱导的多态几何电流
Bicircular Light Induced Multi-State Geometric Current
AI总结：
本研究探讨了双圆光在材料中诱导的光电流，揭示其源于量子几何张量等几何性质的多态特性，并在中心对称系统中通过图解法和Rice-Mele模型证实了该效应，强调了多能带贡献的重要性。
摘要：
我们研究了材料中由双圆光（BCL）诱导的光电流，重点关注其多态几何特性。BCL是左旋和右旋圆偏振光的组合，能够产生注入电流和位移电流，这些电流源于规范不变位移矢量、量子几何张量及三相位乘积的几何性质。关键在于，量子几何张量和三相位乘积的实部在中心对称系统中保持非零，从而促进了光电流的产生，这与传统的位移电流体光伏效应形成对比。采用图解方法，我们系统分析了BCL诱导的光电流，并在一维三站点Rice-Mele模型中证明了其多态几何特性。研究结果为BCL诱导的光电流提供了量子几何层面的理解，强调了在真实材料中考虑多能带贡献的重要性。
英文摘要：
We investigate the photocurrent induced by bicircular light (BCL) in materials, with a focus on its multi-state geometric nature. BCL, a combination of left- and right-circularly polarized light, can generate both injection and shift currents, originating from the geometric properties of gauge-invariant shift vectors, quantum geometric tensors, and triple-phase products. Crucially, the real parts of the quantum geometric tensors and triple-phase products remain nonzero in centrosymmetric systems, facilitating photocurrent generation in contrast to the traditional shift current bulk photovoltaic effect. Using a diagrammatic approach, we systematically analyze the BCL-induced photocurrents and demonstrate the multi-state geometric nature within a one-dimensional three-site Rice-Mele model. Our findings provide a quantum geometric understanding of BCL-induced photocurrents, underscoring the importance of considering multi-band contributions in real materials.
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