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Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 43: Two-Dimensional Materials IV (joint session DS, HL, TT, organized by HL)

TT 43.1: Vortrag

Mittwoch, 22. März 2017, 09:30–09:45, POT 51

Landau-Quantized Graphene: A Tunable Nonlinear Optical Material in the THz Range — •Jacob C. König-Otto1,2, Yongrui Wang3, Alexey Belyanin3, Claire Berger4,5, Walt A. de Heer4, Milan Orlita6,7, Alexej Pashkin1, Harald Schneider1, Manfred Helm1,2, and Stephan Winnerl11Helmholtz-Zentrum Dresden-Rossendorf, Germany — 2Technische Universität Dresden, Germany — 3Texas AM University, USA — 4Georgia Institute of Technology, USA — 5CNRS-Université Alpes, France — 6LNCMI, Grenoble, France — 7Charles University in Prague, Czech Republic

Finding nonlinear optical materials for the THz and mid-infrared regimes is not straightforward. State-of-the-art devices with a high third-order optical susceptibility are often processed as complex multi-quantum-well structures designed to feature one specific resonance frequency. In our work we study Landau-quantized graphene as a tunable and simple to produce nonlinear material. To this end we perform time-integrated degenerate four-wave mixing (FWM) experiments at a photon energy of 78 meV resonant to the transitions between the Landau levels LL−1, LL0 and LL1 at a magnetic field of roughly 4 T. We can recover expected scaling of the FWM-signal with the incident fields and the resonance behavior. The value of the third-order surface susceptibility in this material is in agreement with our calculations based on the density matrix formalism. We find the order of χ(3) of Landau-quantized graphene to be competitive with more complex and elaborated solutions.

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