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Terahertz radiation induced photocurrents in graphene subjected to an in-plane magnetic field

P. Olbrich ; C. Drexler ; S. A. Tarasenko ; J. Karch ; M. Hirmer ; F. Muller ; M. Gmitra ; J. Fabian ; R. Yakimova ; S. Lara-Avila ; Sergey Kubatkin (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; S. D. Ganichev
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz (2162-2027). (2012)
[Konferensbidrag, refereegranskat]

We report on the observation of terahertz radiation induced photocurrents in single-layer graphene samples subjected to an in-plane magnetic field. The photosignal is observed for both, linearly and circularly polarized radiation. A remarkable effect is that the current inverts its sign not only by switching the magnetic field direction, but as well by changing the radiation helicity from left- to right-handedness. We demonstrate that the photocurrent stems from strong structure inversion asymmetry (SIA) of samples originating from the presence of substrate and/or adatoms on graphene. The analysis shows that the observed effect represents a new type of ratchet effects: magnetic field induced ratchets. A microscopic theory of the observed effect is developed being in a good qualitative agreement with the experiment. Furthermore, the experiments open a promising access to the investigation of SIA which is of particular interest for the understanding of graphene properties as well as applications.

Denna post skapades 2013-02-25.
CPL Pubid: 174032


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Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik



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