Using Non-Equilibrium Dynamics to Probe Competing Orders in a Mott-Peierls System

ORAL

Abstract

The competition between ordered phases and the associated quantum criticality are significant in the study of strongly correlated systems. Here we examine one aspect, the non-equilibrium dynamics of a photoexcited Mott-Peierls system, using an effective Hubbard-bond-phonon model and exact diagonalization. Near the quantum phase transition where spin and charge become intertwined, we observe anti-phase dynamics and coupling-strength-dependent suppression or enhancement in the static structure factors. The renormalized bosonic excitations coupled to a photoemitted electron can be extracted from the spin and charge dynamics, providing an approach for characterizing the underlying bosonic modes. The results from this analysis for different electron momenta show uneven softening of bosonic modes due to a stronger coupling near $k_F$. This behavior reflects the strong link between the fermionic momenta, the coupling vertices, and ultimately the bosonic susceptibilities near a quantum phase transition.

–

Authors

  • Yao Wang

    Stanford University, SIMES, SLAC National Accelerator Laboratory/Stanford University

  • Brian Moritz

    SIMES SLAC National Accelerator Laboratory

  • Cheng-Chien Chen

    Argonne National Laboratory

  • Chunjing Jia

    SIMES, SLAC National Accelerator Laboratory and Stanford University, Stanford Institute for Materials and Energy Sciences, SLAC & Stanford University, SIMES SLAC National Accelerator Laboratory, Department of Applied Physics, Stanford University; Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator

  • Michel van Veenendaal

    Argonne National Laboratory/Northern Illinois University,

  • Tom Devereaux

    SIMES, SLAC National Accelerator Laboratory and Stanford University, Stanford Institute for Materials and Energy Sciences, SLAC & Stanford University, SIMES SLAC National Accelerator Laboratory, Stanford Institute of Materials and Energy Sciences, SLAC, Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA, USA, Stanford University