Phase separation induced by symmetric monocycle optical pulse in extended hubbard models

Hiroki Yanagiya, Yasuhiro Tanaka, Kenji Yonemitsu

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Many-electron dynamics induced by a symmetric monocycle electric-field pulse of large amplitude is theoretically investigated in one-and two-dimensional half-filled extended Hubbard models on regular lattices (i.e., without dimerization) using the exact diagonalization method for small systems and the Hartree-Fock approximation for large systems. The formation of a negative-Temperature state and the change from repulsive interactions to effective attractive interactions are shown to be realized for a wide region of the field amplitude and the excitation energy. For a nonnegligible intersite repulsive interaction, the numerical results are consistent with the fact that the phase separation between charge-rich and charge-poor regions is caused by the corresponding effective attraction.

Original languageEnglish
Article number094705
JournalJournal of the Physical Society of Japan
Issue number9
Publication statusPublished - 2015 Sep 15
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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