Terahertz radiation induced photocurrents in graphene subjected to an in-plane magnetic field
Paper i proceeding, 2012

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.

Författare

P. Olbrich

C. Drexler

S. A. Tarasenko

J. Karch

M. Hirmer

F. Muller

M. Gmitra

J. Fabian

R. Yakimova

S. Lara-Avila

Sergey Kubatkin

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

S. D. Ganichev

International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz

2162-2027 (ISSN)

Ämneskategorier

Fysik

DOI

10.1109/IRMMW-THz.2012.6380339

ISBN

978-146731597-5