Edge photocurrent driven by THz electric field in bi-layer graphene

Abstract

We report on the observation of edge electric currents excited in bi-layer graphene by terahertz laser radiation. We show that the current generation belongs to the class of second order in electric field phenomena and is controlled by the orientation of the THz electric field polarization plane. Additionally, applying a small magnetic field normal to the graphene plane leads to a phase shift in the polarization dependence. Increasing the magnetic field strength, the current starts to exhibit 1/B-magnetooscillations with a period consistent with that of the Shubnikov-de-Haas effect and amplitude by an order of magnitude larger as compared to the current at zero magnetic field measured under the same conditions. The microscopic theory developed shows that the current is formed in the edges vicinity limited by the mean-free path of carriers and the screening length of the high-frequency electric field. The current originates from the alignment of the free carrier momenta and dynamic accumulation of charge at the edges, where the P-symmetry is naturally broken. The observed magnetooscillations of the photocurrent are attributed to the formation of Landau levels.

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• Edge photogalvanic effect caused by optical alignment of carrier momenta in 2D Dirac materials
• Photocurrents induced by structured light
• Nonlinear intensity dependence of terahertz edge photocurrents in graphene
• Edge photocurrent in bilayer graphene due to inter-Landau-level transitions
• Photovoltaic Hall effect in two-dimensional electron gas: Kinetic theory
• Polarization-resolving graphene-based mid-infrared detector
• Second harmonic generation due to spatial structure of radiation beam
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• Second harmonic generation at the edge of a two-dimensional electron gas
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• Faraday and Kerr rotation due to photoinduced orbital magnetization in two-dimensional electron gas
• Photon drag at the junction between metal and 2d semiconductor
• Edge spin galvanic effect in altermagnets