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HL: Fachverband Halbleiterphysik

HL 34: Two-dimensional materials III (joined session with TT)

HL 34.11: Vortrag

Dienstag, 21. März 2017, 12:45–13:00, POT 51

Nonlinear Hall voltage from magnetic hot-spots — •Karina A. Guerrero Becerra, Andrea Tomadin, Andrea Toma, Remo Proietti Zaccaria, Francesco De Angelis, and Marco Polini — Istituto Italiano di Tecnologia, via Morego 30, I-16163 Genova, Italy

Electromagnetic simulations have recently shown that specifically designed plasmonic nanostructures are able to enhance and localize an oscillating magnetic field within a micro-meter area. These magnetic hot-spots, generated by forcing the plasmonic resonances of planar nanostructures to generate displacement currents of coil-type shape, have been shown to operate in the NIR [A. Nazir, et. al. Nano. Lett., 14, 3166-3171 (2014)] and in the MIR [S. Panaro, et. al. Nano. Lett., 15, 6128-6134 (2015)] frequency regions. Operating frequencies can be extended towards the THz regime. Here we propose that magnetic hot-spots might be probed through transport measurements by exploiting the response of the 2D electron gas (2DEG) hosted in a graphene bar, placed within the hot-spot area. We study the response of the 2DEG, being subject to the oscillating in-plane electric field of the radiation driving the coil-type resonance, and to the localized magnetic field induced by it. We found that the response of the graphene 2DEG drives a rectification effect giving rise to a measurable Hall-like dc voltage, being sensitive to the operational frequency of the hot-spot. We discuss the conditions under which the predicted dc voltage is experimentally accessible, within the range of frequencies from THz to MIR. We show that the electric and magnetic fields within the hot-spot launch graphene plasma waves.