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arXiv 1002.1047cond-mat.mes-hall
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石墨烯中光子螺旋度驱动的电流

Photon helicity driven electric currents in graphene

J. Karch, P. Olbrich, M. Schmalzbauer, C. Brinsteiner, U. Wurstbauer, M. M. Glazov, S. A. Tarasenko, E. L. Ivchenko, D. Weiss, J. Eroms, S. D. Ganichev

摘要:

我们报告的光子螺旋驱动电流在石墨烯的观察。定向净电流在单层石墨烯中由垂直和倾斜入射的圆偏振太赫兹激光辐射产生,并且在反转辐射螺旋度时改变其符号。发展了观测到的光电流的唯象理论和微观理论。我们证明了在斜入射下,电流是由石墨烯片内部的圆形光子拖曳效应引起的。相比之下,在垂直入射的效果源于样品的边缘,这降低了对称性,并导致在辐射场驱动的载流子的非对称散射。除了光子螺旋度相关的电流,我们还观察到光电流响应线偏振辐射。这种影响的微观机制进行了讨论。

英文摘要:

We report on the observation of photon helicity driven currents in graphene. The directed net electric current is generated in single layer graphene by circularly polarized terahertz laser radiation at normal as well as at oblique incidence and changes its sign upon reversing the radiation helicity. The phenomenological and microscopic theories of the observed photocurrents are developed. We demonstrate that under oblique incidence the current is caused by the circular photon drag effect in the interior of graphene sheet. By contrast, the effect at normal incidence stems from the sample edges, which reduce the symmetry and result in an asymmetric scattering of carriers driven by the radiation field. Besides a photon helicity dependent current we also observe photocurrents in response to linearly polarized radiation. The microscopic mechanisms governing this effect are discussed.

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