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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.

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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.