论文标题
通过非线性光学响应检测量子几何张量
Detection of quantum geometric tensor by nonlinear optical response
论文作者
论文摘要
量子几何张量（QGT），包括定义为量子公制的对称实际部分和定义为浆果曲率的反对称部分，对于理解许多现象至关重要。我们通过理论分析在这项工作中研究了多波段系统的光藻类效应。我们得出的结论是，动量空间中QGT对称部分的梯度的积分与线性光钙化效应有关，而浆果曲率的梯度的积分与圆形光钙化效应有关。在QGT方面，我们的工作为光藻素效应提供了另一种解释，并通过非线性光学响应来检测QGT的简单方法。
Quantum geometric tensor (QGT), including a symmetric real part defined as quantum metric and an antisymmetric part defined as Berry curvature, is essential for understanding many phenomena. We studied the photogalvanic effect of a multiple-band system with time-reversal-invariant symmetry by theoretical analysis in this work. We concluded that the integral of gradient of the symmetric part of QGT in momentum space is related to the linearly photogalvanic effect, while the integral of gradient of Berry curvature is related to the circularly photogalvanic effect. Our work afforded an alternative interpretation for the photogalvanic effect in the view of QGT, and a simple approach to detect the QGT by nonlinear optical response.
