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Many-Body Effects on High-Harmonic Generation in Hubbard Ladders
Yuta Murakami1,2, Thomas Hansen3, Shintaro Takayoshi4
1Tohoku University, Institute for Materials Research, Sendai 980-8577, Japan.
Physical Review Letters
|March 25, 2025
Summary
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.
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.
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