12 papers · 1 filter
Coupling-dependent rates of energy transfers from photoexcited Mott insulators to lattice vibrations
Kenji Yonemitsu, Nobuya Maeshima
Photoexcited states are relaxed by transferring energy to the environments. In order to study which coupling allows fast energy transfer to lattice vibrations in correlated electro…
Mott insulating state in a quarter-filled two-orbital Hubbard chain with different bandwidths
S. Miyashita, Y. Yamashita, K. Yonemitsu +2
We investigate the ground-state properties of the one-dimensional two-band Hubbard model with different bandwidths. The density-matrix renormalization group method is applied to ca…
Enhanced coherent dynamics near a transition between neutral quantum-paraelectric and ionic ferroelectric phases in the quantum Blume-Emery-Griffiths model
Kenji Yonemitsu
Nonequilibrium dynamics are studied near the quantum phase transition point in the one-dimensional quantum Blume-Emery-Griffiths model. Its pseudo-spin component represents…
Polaronic states with Spin-Charge-Coupled Excitation in a 1D Mott Insulator K-TCNQ
Nobuya Maeshima, Kenji Yonemitsu
We discuss photogenerated midgap states of a one-dimensional (1D) dimerized Mott insulator, potassium-tetracyanoquinodimethane (K-TCNQ). Two types of phonon modes are taken into ac…
Suppression of rectification at metal-Mott-insulator interfaces
Kenji Yonemitsu, Nobuya Maeshima, Tatsuo Hasegawa
Charge transport through metal-Mott-insulator interfaces is studied and compared with that through metal-band-insulator interfaces. For band insulators, rectification has been know…
Photoinduced melting of charge order in a quarter-filled electron system coupled with different types of phonons
Kenji Yonemitsu, Nobuya Maeshima
Photoinduced melting of charge order is calculated by using the exact many-electron wave function coupled with classically treated phonons in the one-dimensional quarter-filled Hub…