73 citations · 1.1k across the 69 of their papers we have counts for
5 papers · 1 filter
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…
Spin and Charge Fluctuations and Lattice Effects on Charge Orders in α-(BEDT-TTF)_2I_3
Satoshi Miyashita, Kenji Yonemitsu
The effects of spin and charge fluctuations and electron-phonon couplings on charge ordering in α-(BEDT-TTF)_2I_3 (BEDT-TTF=bis(ethylenedithio)-tetrathiafulvalence) are investigate…
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…
Charge Order with Structural Distortion in Organic Conductors: Comparison between θ-(ET)2RbZn(SCN)4 and α-(ET)2I3
Yasuhiro Tanaka, Kenji Yonemitsu
Charge ordering with structural distortion in quasi-two-dimensional organic conductors θ-(ET)2RbZn(SCN)4 (ET=BEDT-TTF) and α-(ET)2I3 is investigated theoretically. By using the Har…