title: Four-Wave Mixing in Landau-Quantized Graphene.
abstract: For Landau-quantized graphene, featuring an energy spectrum consisting of nonequidistant Landau levels, theory predicts a giant resonantly enhanced optical nonlinearity. We verify the nonlinearity in a time-integrated degenerate four-wave mixing (FWM) experiment in the mid-infrared spectral range, involving the Landau levels LL-1, LL0and LL1. A rapid dephasing of the optically induced microscopic polarization on a time scale shorter than the pulse duration (∼4 ps) is observed, while a complementary pump-probe experiment under the same experimental conditions reveals a much longer lifetime of the induced population. The FWM signal shows the expected field dependence with respect to lowest order perturbation theory for low fields. Saturation sets in for fields above ∼6 kV/cm. Furthermore, the resonant behavior and the order of magnitude of the third-order susceptibility are in agreement with our theoretical calculations.
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf , P.O. Box 510119, 01314 Dresden, Germany.|Technische Universität Dresden , 01062 Dresden, Germany.
authors.forename: Jacob C
authors.identifier: 0000-0002-2470-1261
authors.initials: JC
authors.lastname: König-Otto
authors.affiliation: Texas A&M University , College Station, Texas 77843-4242, United States.
authors.forename: Yongrui
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Texas A&M University , College Station, Texas 77843-4242, United States.
authors.forename: Alexey
authors.initials: A
authors.lastname: Belyanin
authors.affiliation: Georgia Institute of Technology , Atlanta, Georgia 30332, United States.|Institut Néel, CNRS-Université Alpes , 38042 Grenoble, France.
authors.forename: Claire
authors.initials: C
authors.lastname: Berger
authors.affiliation: Georgia Institute of Technology , Atlanta, Georgia 30332, United States.
authors.forename: Walter A
authors.initials: WA
authors.lastname: de Heer
authors.affiliation: LNCMI, CNRS-UGA-UPS-INSA , 38042 Grenoble, France.|Institute of Physics, Charles University in Prague , 12116 Prague, Czech Republic.
authors.forename: Milan
authors.initials: M
authors.lastname: Orlita
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf , P.O. Box 510119, 01314 Dresden, Germany.
authors.forename: Alexej
authors.initials: A
authors.lastname: Pashkin
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf , P.O. Box 510119, 01314 Dresden, Germany.
authors.forename: Harald
authors.initials: H
authors.lastname: Schneider
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf , P.O. Box 510119, 01314 Dresden, Germany.|Technische Universität Dresden , 01062 Dresden, Germany.
authors.forename: Manfred
authors.initials: M
authors.lastname: Helm
authors.affiliation: Helmholtz-Zentrum Dresden-Rossendorf , P.O. Box 510119, 01314 Dresden, Germany.
authors.forename: Stephan
authors.initials: S
authors.lastname: Winnerl
keywords: Graphene; Landau-quantization; four-wave mixing; nonlinear optics