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Ratchet effect in spatially modulated bilayer graphene: Signature of hydrodynamic transport

Mönch, E. ; Potashin, S. O. ; Lindner, K. ; Yahniuk, I. ; Golub, L. E. ; Kachorovskii, V. Yu. ; Bel'kov, V. V. ; Huber, R. ; Watanabe, K. ; Taniguchi, T. ; Eroms, J. ; Weiss, D. ; Ganichev, S. D.


We report on the observation of the ratchet effect-generation of direct electric current in response to external terahertz radiation-in bilayer graphene, where inversion symmetry is broken by an asymmetric dual-grating gate potential. As a central result, we demonstrate that at high temperature, T = 150 K, the ratchet current decreases at high frequencies as proportional to 1/omega 2, while at ...


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