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.

*ES acknowledges support from the NSF GRFP (1747452). JL acknowledges support from ONR N00014-20-1-2481. JL, PI and CBE acknowledge support from DOE-QIS. The research is funded in part by the Gordon and Betty Moore Foundation's EPiQS Initiative, grant GBMF9065 to C.B.E. and Vannevar Bush Faculty Fellowship (ONR N00014-20-1-2844).

–

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