第5回 物理工学科教室談話会 （講師：Prof. Peter Prelovsek）
|講演者：||Prof. Peter Prelovsek（Faculty of Mathematics and Physics, University of Ljubljana）|
|題 目：||Nonequilibrium properties of Mott-Hubbard insulators|
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.