Cyclotron- and magnetoplasmon resonances in bilayer graphene ratchets
Abstract
We report on a tunable - by magnetic field and gate voltage - conversion of terahertz radiation into a dc current in spatially modulated bilayer graphene. We experimentally demonstrate that the underlying physics is related to the so-called ratchet effect. Our key findings are the direct observation of a sharp cyclotron resonance in the photocurrent and the demonstration of two effects caused by electron-electron interaction: the plasmonic splitting of the resonance due to long-range Coulomb coupling and the partial suppression of its second harmonic due to fast interparticle collisions. We develop a theory which perfectly fits our data. We argue that the ratchet current is generated in the hydrodynamic regime of non-ideal electron liquid.
Keywords
Cite
@article{arxiv.2208.08299,
title = {Cyclotron- and magnetoplasmon resonances in bilayer graphene ratchets},
author = {Erwin Mönch and Sergey O. Potashin and Katja Lindner and Ivan Yahniuk and Leonid E. Golub and Valentin Yu. Kachorovskii and Vassily V. Bel'kov and Robin Huber and Kenji Watanabe and Takashi Taniguchi and Jonathan Eroms and Dieter Weiss and Sergey D. Ganichev},
journal= {arXiv preprint arXiv:2208.08299},
year = {2023}
}
Comments
13 pages, 10 figures