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arXiv · 2011.10070

Edge photogalvanic effect caused by optical alignment of carrier momenta in 2D Dirac materials

M. V. Durnev·S. A. Tarasenko
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Abstract

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.

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M. V. Durnev, S. A. Tarasenko. 2020-11-19. Edge photogalvanic effect caused by optical alignment of carrier momenta in 2D Dirac materials. https://doi.org/10.1103/physrevb.103.165411

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