Photoinduced nonequilibrium phenomena in magnets with strong electron correlation are
reviewed. Owing to the strong competition between electron itineracy and localization and …

LaCoO3 is known for its two-step spin crossover as a function of temperature. Despite efforts
spanning over half a century, the origin of this phenomenon is still debated, particularly …

We study the dynamics of excitonic insulators coupled to phonons using the time-dependent
mean-field theory. Without phonon couplings, the linear response is given by the damped …

We consider a two-band spinless model describing an excitonic insulator (EI) on the two-
dimensional square lattice with anisotropic hop** parameters and electron-phonon (el-ph) …

Bose-Einstein condensation of electron-hole pairs, exciton condensation, has been
effortfully investigated since predicted 60 years ago. Irrefutable evidence has still been …

We present a dynamical mean-field study of dynamical susceptibilities in the two-band
Hubbard model. Varying the model parameters we analyze the two-particle excitations in the …

We investigate the microscopic mechanisms of the charge-density-wave (CDW) formation in
a monolayer TiSe 2 using a realistic multiorbital dp model with electron-phonon coupling …

First-principles calculations reveal an unusual electronic state (dubbed as half excitonic
insulator) in monolayer 1 T-MX 2 (M= Co, Ni and X= Cl, Br). Its one spin channel has a many …

The spin states of Co 3+ ions in perovskite-type LaCoO 3, governed by the complex
interplay between the electron-lattice interactions and the strong electron correlations, still …

Magnetic field (H) effects on a correlated electron system with a spin-state degree of
freedom are examined. The effective Hamiltonian derived from the two-orbital Hubbard …