Edge photocurrent driven by terahertz electric field in bilayer graphene
| Autor: | J. Keil, Yaping Yang, Jun Yin, V. V. Bel'kov, Vladimir I. Fal'ko, Helene Plank, Seok-Kyun Son, Sergey Ganichev, Mikhail V. Durnev, S. A. Tarasenko, Artem Mishchenko, Sergey Slizovskiy, S. Candussio |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Photocurrent
Materials science Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Terahertz radiation ddc:530 FOS: Physical sciences 02 engineering and technology Landau quantization 021001 nanoscience & nanotechnology Polarization (waves) 530 Physik 01 natural sciences 7. Clean energy Magnetic field Electric field 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Electric current 010306 general physics 0210 nano-technology Bilayer graphene |
| Zdroj: | Physical Review B |
| Popis: | We report on the observation of edge electric currents excited in bilayer 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. With increasing the magnetic field strength, the current starts to exhibit 1/B-magneto-oscillations 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 edge's 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 magneto-oscillations of the photocurrent are attributed to the formation of Landau levels. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|