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Many-electron dynamics induced by a symmetric monocycle electric-field pulseof large amplitude is theoretically investigated in one- and two-dimensionalhalf-filled extended Hubbard models on regular lattices (i.e., withoutdimerization) using the exact diagonalization method for small systems and theHartree-Fock approximation for large systems. The formation of anegative-temperature state and the change from repulsive interactions toeffective attractive interactions are shown to be realized for a wide region ofthe field amplitude and the excitation energy. For a nonnegligible intersiterepulsive interaction, the numerical results are consistent with the fact thatthe phase separation between charge-rich and charge-poor regions is caused bythe corresponding effective attraction.

Phase Separation Induced by Symmetric Monocycle Optical Pulse in Extended Hubbard Models