日本RIKEN新兴物质科学中心Naoto Nagaosa团队研究了光子拖曳光伏效应与量子几何性质。相关论文发表在2025年2月27日出版的《美国科学院院刊》杂志上。
体光伏效应（BPVE）在均匀照射下产生直流光电流，是一种传统上在非中心对称材料中研究的非线性光学效应。BPVE的两个主要来源是分别由光学激发过程中电子位置和电子速度的转变引起的偏移和注入电流。最近，有人提出光子拖曳效应可以解锁中心对称材料中的BPVE。然而，实验进展仍然有限。
在这项工作中，研究组对诱导BPVE（光子拖曳BPVE）的光子拖曳效应进行了全面的理论分析。值得注意的是，他们发现光子拖曳BPVE可以直接与量子几何张量联系起来。此外，该研究提出，在非磁性中心对称材料中，光子拖移电流可以与其他电流贡献完全隔离。他们明确地将该理论应用于二维拓扑绝缘体1T′-WTe2。此外，课题组研究了中心对称磁性Weyl半金属中的光子拖曳BPVE，其中证明了线偏振光会产生光子拖曳位移电流。
附：英文原文
Title: Photon-drag photovoltaic effects and quantum geometric nature
Author: Xie, Ying-Ming, Nagaosa, Naoto
Issue&Volume: 2025-2-27
Abstract: The bulk photovoltaic effect (BPVE) generates a direct current photocurrent under uniform irradiation and is a nonlinear optical effect traditionally studied in noncentrosymmetric materials. The two main origins of BPVE are the shift and injection currents, arising from transitions in electron position and electron velocity during optical excitation, respectively. Recently, it was proposed that photon-drag effects could unlock BPVE in centrosymmetric materials. However, experimental progress remains limited. In this work, we provide a comprehensive theoretical analysis of photon-drag effects inducing BPVE (photon-drag BPVE). Notably, we find that photon-drag BPVE can be directly linked to quantum geometric tensors. Additionally, we propose that photon-drag shift currents can be fully isolated from other current contributions in nonmagnetic centrosymmetric materials. We apply our theory explicitly to the 2D topological insulator 1T′-WTe2. Furthermore, we investigate photon-drag BPVE in a centrosymmetric magnetic Weyl semimetal, where we demonstrate that linearly polarized light generates photon-drag shift currents.
DOI: 10.1073/pnas.2424294122
Source: https://www.pnas.org/doi/abs/10.1073/pnas.2424294122