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Exciton-phonon cooperative mechanism of the triple- charge-density-wave and antiferroelectric electron polarization in TiSe
Tatsuya Kaneko, Yukinori Ohta, Seiji Yunoki
We investigate the microscopic mechanisms of the charge-density-wave (CDW) formation in a monolayer TiSe using a realistic multiorbital - model with electron-phonon coupl…
Excitonic Insulator State of the Extended Falicov-Kimball Model in the Cluster Dynamical Impurity Approximation
Kosuke Hamada, Tatsuya Kaneko, Shohei Miyakoshi +1
We comparatively study the excitonic insulator state in the extended Falicov-Kimball model (EFKM, a spinless two-band model) on the two-dimensional square lattice using the variati…
Mott transition and magnetism of the triangular-lattice Hubbard model with next-nearest-neighbor hopping
Kazuma Misumi, Tatsuya Kaneko, Yukinori Ohta
The variational cluster approximation is used to study the isotropic triangular-lattice Hubbard model at half filling, taking into account the nearest-neighbor () and next-nea…