Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 12: HL Poster I

HL 12.4: Poster

Montag, 1. April 2019, 17:30–20:00, Poster E

Edge currents driven by terahertz radiation in graphene in the quantum Hall regime — •Susanne Candussio¹, Helene Plank¹, Mikhail Durnev², Johanna Pernul¹, Kathrin-Maria Dantscher¹, Erwin Mönch¹, Andreas Sandner¹, Jonathan Eroms¹, Dieter Weiss¹, Vasily V. Belkov², Sergey A. Tarasenko², and Sergey Ganichev¹ — ¹Terahertz Center, University of Regensburg, Germany — ²Ioffe Institute, St. Petersburg, Russia

We observe that the illumination of unbiased graphene in the quantum Hall regime with polarized terahertz laser radiation results in a direct edge current. This photocurrent is caused by an imbalance of persistent edge currents, which are driven out of thermal equilibrium by indirect transitions within the chiral edge channel. The direction of the edge photocurrent is determined by the polarity of the external magnetic field, while its magnitude depends on the radiation polarization. The microscopic theory developed in this paper describes well the experimental data.