Excitonic effects on high-harmonic generation in Mott insulators

Mina Udono, Koudai Sugimoto, Tatsuya Kaneko, Yukinori Ohta

Research output: Contribution to journalArticlepeer-review

Abstract

To study excitonic effects on high-harmonic generation (HHG) in Mott insulators, we investigate pumped nonequilibrium dynamics in the one-dimensional extended Hubbard model. By employing time-dependent calculations based on the exact diagonalization and infinite time-evolving block decimation methods, we find the strong enhancement of the HHG intensity around the exciton energy. The subcycle analysis in the sub-Mott-gap regime shows that the intensity region of the time-resolved spectrum around the exciton energy splits into two levels and oscillates following the driving electric field. This excitonic dynamics is qualitatively different from the dynamics of free doublon and holon but favorably contributes to HHG in the Mott insulator.

Original languageEnglish
Article numberL241108
JournalPhysical Review B
Volume105
Issue number24
DOIs
Publication statusPublished - 2022 Jun 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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