Theory of time-resolved resonant inelastic x-ray scattering for studying material dynamics

ORAL

Abstract

With recent progress in the X-ray beamline and pump-probe instrumentation, time-resolved RIXS (tr-RIXS) promises to detect the nonequilibrium dynamics of collective modes, which play significant roles in quantum materials. Here we present a theory for evaluating the tr-RIXS cross-section. This time-domain theory is based on nonequilibrium linear response and can reproduce the common Kramers-Heisenberg formula at equilibrium. We numerically evaluated tr-RIXS cross-section for some example systems out of equilibrium, including a graphene nanoribbon and the 2D single-band Hubbard model. We show that tr-RIXS can capture the dynamics of multi-particle Floquet excitations in a momentum-resolved way, revealing underlying physics such as Floquet band renormalization, topological edge states, and pump-induced collective excitations.

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Presenters

  • Yuan Chen

    • Department of Applied Physics, Stanford University

Authors

  • Yuan Chen

    • Department of Applied Physics, Stanford University

  • Yao Wang

    • Harvard University
    • Department of Physics, Harvard University
    • Physics, Harvard University

  • Chunjing Jia

    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    • SIMES, SLAC National Accelerator Lab
    • SSRL Materials Science Division, SLAC National Accelerator Laboratory and Stanford University
    • Stanford University

  • James Freericks

    • Department of Physics, Georgetown University
    • Georgetown University

  • Andrij Shvaika

    • Institute for Condensed Matter Physics, National Academy of Sciences of Ukraine

  • Brian Moritz

    • Stanford University
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    • SLAC National Accelerator Laboratory
    • SLAC and Stanford University
    • Institute for Materials and Energy Science, Stanford
    • SSRL Materials Science Division, SLAC National Accelerator Laboratory and Stanford University

  • Thomas Devereaux

    • Stanford University
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
    • SLAC National Accelerator Laboratory
    • Physics, Stanford University
    • SLAC and Stanford University
    • Institute for Materials and Energy Science, Stanford
    • SIMES, SLAC National Accelerator Lab
    • SLAC National Accelerator Laboratory and Stanford University, Stanford Institute for Materials and Energy Sciences
    • SLAC, Stanford
    • SIMES, SLAC, and Stanford University
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University