Thoretical Study on Quantum Domain Walls in Ferroelectrics

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I have completely clarified the magnetoelectric phase diagram of the multiferroic Mn perovskites through constructing their microscopic spin model and analyzing it using Monte-Carlo method for the first time in the world. I have also elucidated their phase diagrams in magnetic fields, a mechanism of the field-induced electric transition, and a mechanism of the electromagnon excitations activated by oscillating electric-field component of light in the study on magnetoelectric cross-correlation responses of this class of materials. Also I have predicted the optical switching of spin chirality via the intense electromagnon excitations, and have clarified the chirality reversal and flop processes accompanied by characteristic spatial-pattern formations with dynamical chirality-domain stripes.