High Harmonic Generation in a Correlated Electron System

Shohei Imai, Atsushi Ono, Sumio Ishihara

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)


High harmonic generation in crystalline solids has been examined so far on the basis of one-body energy-band structures arising from electron itineracy in a periodic potential. Here, we show the emergence of high harmonic generation signals which are attributed to the dynamics of many-body states in a low-dimensional correlated electron system. An interacting fermion model and its effective pseudospin model on a one-dimensional dimer-type lattice are analyzed. Observed high harmonic generation signals in a spontaneously symmetry-broken state, where charge densities are polarized inside of dimer units, show threshold behavior with respect to light amplitude and are interpreted in terms of tunneling and recombination of kink-antikink excitations in an electric field.

Original languageEnglish
Article number157404
JournalPhysical Review Letters
Issue number15
Publication statusPublished - 2020 Apr 17


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