Aarhus University Seal

Doping effects in high-harmonic generation from correlated systems

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Using the one-dimensional Hubbard model, which is commonly used for describing, e.g., high-Tc superconducting cuprates, we study high-harmonic generation (HHG) from doped, correlated materials. Doping is modeled by changing the number of electrons in the lattice from the conventional half-filling case. For relatively small Hubbard U, i.e., small electron-electron correlation, we find little to no effect of doping on the dynamics and the HHG spectra. For increasing U the degree of doping has a marked effect on the dynamics and spectra. We explain these findings through the quasiparticle-based doublon-holon picture. The dynamics are separated into two types, first, doublon and holon movement, and, second, doublon-holon pair creation and annihilation. Doping results in all configurations containing doublons or holons. Those quasiparticles can move at no extra cost in energy regardless of the correlation level. This motion at no energy cost increases the high-harmonic gain for low- and medium-harmonic orders. We discuss that in the high-U limit, antiferromagnetic ordering becomes increasingly unlikely with increasing doping rates and explain an associated drop in the high-order harmonics relative to the case of half-filling.

Original languageEnglish
Article number235142
JournalPhysical Review B
Publication statusPublished - Dec 2022

Bibliographical note

Publisher Copyright:
© 2022 American Physical Society.

See relations at Aarhus University Citationformats

ID: 301484335