title: Using Nonequilibrium Dynamics to Probe Competing Orders in a Mott-Peierls System.
abstract: Competition between ordered phases, and their associated phase transitions, are significant in the study of strongly correlated systems. Here, we examine one aspect, the nonequilibrium dynamics of a photoexcited Mott-Peierls system, using an effective Peierls-Hubbard model and exact diagonalization. Near a transition where spin and charge become strongly intertwined, we observe antiphase dynamics and a coupling-strength-dependent suppression or enhancement in the static structure factors. The renormalized bosonic excitations coupled to a particular photoexcited electron can be extracted, which provides an approach for characterizing the underlying bosonic modes. The results from this analysis for different electronic momenta show an uneven softening 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 when multiple phases compete for the ground state of the system.
authors.affiliation: Department of Applied Physics, Stanford University, Stanford, California 94305, USA.|SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.affiliation: SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, 2575 Sand Hill Road, Menlo Park, California 94025, USA.|Department of Physics and Astrophysics, University of North Dakota, Grand Forks, North Dakota 58202, USA.
authors.forename: B
authors.initials: B
authors.lastname: Moritz
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: C-C
authors.initials: CC
authors.lastname: Chen
authors.affiliation: SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
authors.forename: C J
authors.initials: CJ
authors.lastname: Jia
authors.affiliation: Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA.|Department of Physics, Northern Illinois University, De Kalb, Illinois 60115, USA.
authors.forename: M
authors.initials: M
authors.lastname: van Veenendaal
authors.affiliation: SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences, 2575 Sand Hill Road, Menlo Park, California 94025, USA.|Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA.
authors.forename: T P
authors.initials: TP
authors.lastname: Devereaux