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.

–

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