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Graphene-based nanoscale attosecond light source

ORAL

Abstract

High harmonic generation (HHG) is an extreme nonlinear optical process in which multiple harmonics of a pump laser frequency are emitted from strongly driven carriers. The unique physics of two-dimensional materials and surfaces such as graphene offers new routes to achieving HHG within the solid-state. Extreme ultraviolet (XUV) HHG sources, in particular, will allow for the study of attosecond dynamics in quantum systems. To date, extreme ultraviolet HHG has not been observed in graphene. We report the experimental observation of XUV HHG in monolayer graphene integrated with electrically biased LaAlO3/SrTiO3 nanoscale junctions. Both odd and even harmonics of VIS-NIR pump frequencies are generated up to the 15th harmonic with energy ~22 eV. HHG is observed at input peak intensities orders of magnitude lower than the pump powers required in many previous studies. To our knowledge, this is the first demonstration of XUV HHG in graphene.

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Presenters

  • Erin C Sheridan

    University of Pittsburgh

Authors

  • Erin C Sheridan

    University of Pittsburgh

  • Melanie Dieterlen

    University of Pittsburgh

  • Aditi Nethwewala

    University of Pittsburgh, University of Pittsburgh, Department of Physics and Astronomy, Pittsburgh, PA 15260, USA

  • Qing Guo

    University of Pittsburgh

  • Muqing Yu

    University of Pittsburgh

  • Ki-Tae Eom

    University of Wisconsin - Madison, University of Wisconsin-Madison, Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA, University of Wisconsin Madison

  • Chang-Beom Eom

    University of Wisconsin - Madison, Oxide Laboratory, University of Wisconsin - Madison

  • Patrick R Irvin

    University of Pittsburgh

  • Jeremy Levy

    University of Pittsburgh, University of Pittsburgh, Department of Physics and Astronomy, Pittsburgh, PA 15260, USA