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.

References in corpus (13)

• The electronic properties of graphene
• Boron nitride substrates for high-quality graphene electronics
• Giant Intrinsic Carrier Mobilities in Graphene and Its Bilayer
• Biased bilayer graphene: semiconductor with a gap tunable by electric field effect
• Unconventional quantum Hall effect and Berry's phase of 2pi in bilayer graphene
• The electronic properties of bilayer graphene
• Optical and magneto-optical far-infrared properties of bilayer graphene
• Third harmonic generation in graphene and few-layer graphite films
• Fast and Sensitive Terahertz Detection Using an Antenna-Integrated Graphene pn Junction
• Optical bistability of graphene in the terahertz range
• Quantum ratchet effects induced by terahertz radiation in GaN-based two-dimensional structures
• Magnetic ratchet effect in bilayer graphene
• Nonlinear Response of Bilayer Graphene at Terahertz Frequencies

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• 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
• Infrared photoresistance as a sensitive probe of electronic transport in twisted bilayer graphene
• Terahertz ratchet in graphene 2D metamaterial formed by a patterned gate with an antidot arrayd
• Second harmonic generation at the edge of a two-dimensional electron gas
• 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