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In recent years, researchers have discovered various excited states ofelectrons having an excited domain with a structural order different from theoriginal one. We examine a dynamics of electron system and phonon system byusing the time-dependent Hartree-Fock approximation. We examine time evolutionwith spin degree of freedom. We found a thermally excitedparaelectric-to-ferroelectric crossover. The metastable state is spin pierlsstate. We also examine the Landau expansion of electron system atquarter-filled.

Paraelectric-to-ferroelectric crossover and electron dynamics from time-dependent Hartree-Fock calculations