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Many-Body Effects on High-Harmonic Generation in Hubbard Ladders.

Yuta Murakami1,2, Thomas Hansen3, Shintaro Takayoshi4

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|March 25, 2025
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Summary
This summary is machine-generated.

Spin-charge couplings significantly alter high-harmonic generation (HHG) in Mott insulators. Interchain hopping introduces spin dynamics, creating spin polarons and magnons that modify HHG spectra and reveal new excitation processes.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Optics
  • Materials Science

Background:

  • High-harmonic generation (HHG) is a key probe of electron dynamics in materials.
  • Mott insulators exhibit complex spin-charge couplings that influence their electronic properties.
  • Understanding these couplings is crucial for novel material applications.

Purpose of the Study:

  • Investigate the impact of spin-charge couplings on HHG in Mott insulators.
  • Analyze the role of interchain hopping in modifying HHG spectra.
  • Explore novel excitation mechanisms in correlated materials.

Main Methods:

  • Analysis of the two-leg ladder Hubbard model.
  • Investigating spin dynamics driven by interchain hopping (t_y).
  • Examining the behavior of doublon-holon pairs and spin polarons.

Main Results:

  • Spin-charge separation leads to HHG from coherent doublon-holon pairs when chains are decoupled (t_y=0).
  • Interchain hopping (t_y > 0) reduces doublon-holon coherence and introduces nonlocal spin strings.
  • Spin polarons create an additional plateau in the HHG spectrum.
  • Unconventional HHG involving polarons and magnons observed for large t_y.

Conclusions:

  • Spin dynamics profoundly affect HHG in Mott insulators.
  • HHG spectra reveal signatures of spin polarons and magnons.
  • This work provides a microscopic understanding of many-body effects on HHG in correlated systems.