Phase Separation Induced by Symmetric Monocycle Optical Pulse in Extended Hubbard Models
Abstract
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.
Keywords
Cite
@article{arxiv.1507.04837,
title = {Phase Separation Induced by Symmetric Monocycle Optical Pulse in Extended Hubbard Models},
author = {Hiroki Yanagiya and Yasuhiro Tanaka and Kenji Yonemitsu},
journal= {arXiv preprint arXiv:1507.04837},
year = {2015}
}
Comments
20 pages, 10 figures, accepted for publication in J. Phys. Soc. Jpn