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Using Nonequilibrium Dynamics to Probe Competing Orders in a Mott-Peierls System.

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We studied photoexcited Mott-Peierls systems to understand competing phases. Our findings reveal intertwined spin-charge dynamics and a new way to characterize bosonic modes, crucial for correlated systems.

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Area of Science:

  • Condensed Matter Physics
  • Strongly Correlated Systems
  • Quantum Dynamics

Background:

  • Competition between ordered phases and phase transitions are key in strongly correlated systems.
  • Understanding nonequilibrium dynamics is crucial for probing quantum materials.

Purpose of the Study:

  • To investigate the nonequilibrium dynamics of a photoexcited Mott-Peierls system.
  • To explore the interplay between spin, charge, and bosonic excitations.

Main Methods:

  • Utilized an effective Peierls-Hubbard model.
  • Employed exact diagonalization for numerical analysis.
  • Analyzed photoexcited electron dynamics and bosonic mode renormalization.

Main Results:

  • Observed antiphase dynamics near a spin-charge intertwined transition.
  • Demonstrated coupling-strength-dependent suppression/enhancement of static structure factors.
  • Identified renormalized bosonic excitations and their momentum-dependent softening near kF.

Conclusions:

  • The study provides an approach to characterize underlying bosonic modes in competing phases.
  • Results highlight the strong coupling between fermionic momenta, coupling vertices, and bosonic susceptibilities.
  • Uneven softening of bosonic modes near kF indicates significant electronic momentum influence.