Edge photogalvanic effect caused by optical alignment of carrier momenta in two-dimensional Dirac materials

We show that the interband absorption of radiation in a two-dimensional (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 ratchetlike structure with an array of narrow strips.