第5回　物理工学科教室談話会　（講師：Prof. Peter Prelovsek）

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概要： In the talk I will discuss several aspects of the anomalous behaviour of Mott-Hubbard insulators in a　onequilibrium situations. A model of 1D interacting fermions in the　insulating regime shows that response to driving field is anomalous for the integrable case as opposed to the generic models. The study of the dielectric breakdown within the polarized Hubbard model gives an exact dependence of the threshold field on the　excitation　gap. Finally, the recombination of photoinduced charges in Mott-Hubbard　insulators will be considered for a　realistic model of undoped cuprates. It will be shown that the induced holon and doublons form bound excitons which recombine very efficiently via multimagnon emission, as also observed in ultrafast spectroscopy experiments.
紹介教員： 今田正俊・求幸年