论文标题
边缘光光藻效应是由2D狄拉克材料中载体动量的光学比对引起的
Edge photogalvanic effect caused by optical alignment of carrier momenta in 2D Dirac materials
论文作者
论文摘要
我们表明，2D Dirac材料中辐射的带间吸收会导致在样品边缘流动的直流电流。光电流来自电子和孔的动量比对，并由辐射极化控制。我们开发了这种边缘光钙效应的微观理论，并在存在静态磁场的情况下计算了间隙和无间隙的2D迪拉克材料的光电流，该光电流引入了电子和孔电流之间的额外失衡。此外，我们表明光电流可以在带有狭窄条的棘轮状结构中大量乘以。
We show that the inter-band absorption of radiation in a 2D Dirac material leads to a direct electric current flowing at sample edges. The photocurrent originates from the momentum alignment of electrons and holes and is controlled by the radiation polarization. We develop a microscopic theory of such an edge photogalvanic effect and calculate the photocurrent for gapped and gapless 2D Dirac materials, also in the presence of a static magnetic field which introduces additional imbalance between the electron and hole currents. Further, we show that the photocurrent can be considerably multiplied in a ratchet-like structure with an array of narrow strips.
