Sunday, August 4, 2013

1308.0123 (Peter Olbrich et al.)

Probing of electromagnetic fields on atomic scale by photoelectric
phenomena in graphene

Peter Olbrich, Christoph Drexler, Leonid E. Golub, Sergey N. Danilov, Vadim A. Shalygin, Rositza Yakimova, Samuel Lara-Avila, Sergey Kubatkin, Britta Redlich, Rupert Huber, Sergey D. Ganichev
We report on the observation of the reststrahl band assisted photocurrents in epitaxial graphene on SiC excited by infrared radiation. The peculiar spectral dependence for frequencies lying within the reststrahl band of the SiC substrate provides a direct and noninvasive way to probe the electric field magnitude at atomic distances from the material's surface. Furthermore our results reveal that nonlinear optical and optoelectronic phenomena in 2D crystals and other atomic scale structures can be giantly enhanced by a proper combination of the spectral range and substrate material.
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