拓扑绝缘体
光电流
凝聚态物理
极化(电化学)
光谱学
磁场
材料科学
表面状态
物理
对称(几何)
垂直的
光电子学
化学
曲面(拓扑)
量子力学
几何学
数学
物理化学
作者
Tsubasa Takagi,Ryota Watanabe,Ryutaro Yoshimi,Atsushi Tsukazaki,Kei Takahashi,Masashi Kawasaki,Y. Tokura,Naoki Ogawa
摘要
We demonstrate zero-bias mid-infrared photocurrent generation in topological insulator MnBi2Te4 thin films. The symmetry breakings at the surface and interfaces lead to the coexistence of Dirac and Rashba band states, which enable two kinds of photogalvanic responses. One is the magneto-photogalvanic effect in the presence of an external in-plane magnetic field perpendicular to photocurrent direction, and the other is the light-polarization-dependent linear photogalvanic effect arising from in-plane symmetry breakings, both observed up to room temperature. We disentangle these contributions by light-polarization and temperature dependent spectroscopy under the varying magnetic field.
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