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.

20 pages, 10 figures, accepted for publication in J. Phys. Soc. Jpn

References in corpus (4)

• Dynamical band flipping in fermionic lattice systems: An ac-field-driven change of the interaction from repulsive to attractive
• Repulsion-to-attraction transition in correlated electron systems triggered by a monocycle pulse
• Coupling-dependent rates of energy transfers from photoexcited Mott insulators to lattice vibrations
• Negative-Temperature State Formed and Interactions Inverted by Symmetric Monocycle Optical Pulse Excitation

Cited by in corpus (10)

• Photoinduced $\eta$ Pairing in the Hubbard Model
• Strong light-field effects driven by nearly single-cycle 7-fs light field in correlated organic conductors
• Polarization selectivity of charge localization induced by 7-fs nearly single-cycle light-field in an organic metal
• Photoinduced Enhancement of Anisotropic Charge Correlations on Triangular Lattices with Trimers
• High-Frequency Analysis of Effective Interactions and Bandwidth for Transient States after Monocycle Pulse Excitation of Extended Hubbard Model
• Charge Oscillations Emerging after Application of an Intense Light Field to Superconductors on a Dimer Lattice
• Photoinduced High-Frequency Charge Oscillations in Dimerized Systems
• Excited States beyond Mott Gap in Half-Filled-Band Hubbard Model
• Photoinduced dynamics of excitonic order and Rabi oscillation in the two-orbital Hubbard model
• Competition between Interactions and Randomness in Photoinduced Synchronization of Charge Oscillations on a Dimer Lattice