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Su-Schrieffer-Heeger-like (SSH-like) electron-phonon interactions drive novel states. Resonant inelastic x-ray scattering (RIXS) can identify these couplings in quantum materials, despite complex combined excitations.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science
  • Spectroscopy

Background:

  • Electron-phonon interactions are crucial for novel quantum phenomena.
  • Identifying and quantifying these interactions experimentally is challenging.
  • Su-Schrieffer-Heeger (SSH)-like couplings can lead to exotic states like bipolarons.

Purpose of the Study:

  • Investigate resonant inelastic x-ray scattering (RIXS) as a probe for SSH-like electron-phonon interactions.
  • Develop methods to identify and quantify these interactions in quantum materials.
  • Analyze the RIXS response in a one-dimensional Hubbard-SSH model.

Main Methods:

  • Utilized the density matrix renormalization group (DMRG) method.
  • Computed the full RIXS response spectrum.
  • Modeled a one-dimensional half-filled Hubbard-SSH model with on-site phonons.

Main Results:

  • RIXS experiments reveal coupled charge and magnetic excitations due to lattice vibrations.
  • Combined multiparticle excitations complicate direct interpretation of RIXS data.
  • The complex RIXS response contains signatures of SSH-like electron-phonon couplings.

Conclusions:

  • RIXS is a viable, albeit complex, tool for studying electron-phonon interactions.
  • The coupling of lattice excitations to charge and magnetic sectors provides a unique fingerprint.
  • This work outlines strategies to leverage RIXS for identifying SSH-like interactions in materials.