Detecting Photo-Induced Topological Edge States in a Graphene Nanoribbon Using Pump-Probe Spectroscopies

ORAL

Abstract

Recently, photo-induced topological edge states in low dimensional materials have attracted considerable attention due to the tunability of dispersion and topological properties using light. Here, we present a numerical study of various pump-probe spectroscopies for a graphene nanoribbon subject to circularly polarized pump light. In particular, we calculate time-resolved resonant inelastic x-ray scattering (tr-RIXS) for the graphene nanoribbon, which clearly resolves the pump-induced band gap and the edge states. These tr-RIXS features have a direct correspondence with Floquet states and the calculated time-resolved ARPES spectra. We also calculate the pump-probe optical conductivity and nonresonant Raman scattering, demonstrating that the signatures from the pump-induced gap and edge states also should be visible, especially at low energy. These pump-probe techniques provide powerful tools for detecting photo-induced topological states in low dimensional materials.

–

Presenters

  • Yuan Chen

    • Stanford University

Authors

  • Yuan Chen

    • Stanford University

  • Yao Wang

    • Harvard University
    • Department of Physics, Harvard University

  • Martin Claassen

    • Simons Foundation Flatiron Institute
    • Simons Foundation
    • Center for Computational Quantum Physics, Flatiron Institute
    • Center for Computational Quantum Physics, Simons Foundation Flatiron Institute

  • Brian Moritz

    • SLAC National Accelerator Laboratory and Stanford University, SSRL Materials Science Division
    • SLAC National Accelerator Laboratory
    • SLAC
    • Stanford University
    • SIMES, SLAC
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA

  • Thomas Devereaux

    • Stanford Univ
    • Materials Science and Engineering, Stanford University
    • Stanford University
    • SLAC National Accelerator Laboratory
    • Photon Sciences, Stanford Linear Accelerator (SLAC)
    • SIMES, SLAC
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
    • SLAC National Accelerator Lab.