第3回　サイエンスカフェ講演会を下記の通り開催いたします。

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講師：小川哲生　教授（大阪大学大学院理学研究科）

http://wwwacty.phys.sci.osaka-u.ac.jp/~ogawa/cover.html

日時：６月２日（水）　午前１０時～１１時半
場所：サイエンスカフェ

講演題目：

光誘起相転移について

Photoinduced phase transitions: DYCE optical physics

講演内容：
We are interested in solids, which are composed of many microscopic
components, e.g., atoms and molecules. Such materials exhibit dramatic and
interesting phenomena, such as phase transitions and nonlinear responses,
due to interactions among their constituents. There remain many not yet
understood phenomena that will require highly-sophisticated theoretical
treatments beyond one-body approximations. Our group is trying to explain
these exoctic phenomena, called the photoinduced phase transitions (PIPTs),
using analytical and computational techniques. Specifically, we study
dynamical/nonlinear responses of condensed matter, in particular,
cooperative phenomena related to optically-excited states of quantum
many-body systems. In other words, we explore coupled systems, where the
fermionic (electronic) fields and the bosonic (photonic, phononic,
excitonic, biexcitonic) fields are interacting with each other. One of our
main subjects is the "electron-hole (e-h) systems" in photoexcited
semiconductors, where the Coulomb interaction leads to the formation of
various phases such as the exciton gas, e-h plasma, e-h liquids, exciton
Bose-Einstein condensation, and e-h BCS condensate. We perform systematic
and quantitative surveys of such phases focusing on the following: (i) The
phase diagram of e-h ensembles including exciton condensation and Mott
transition. (ii) Evaluation of dynamical and coherence properties of light
emitted from such e-h ensembles. (iii) Theoretical modeling of the dynamics
of quantum phase transition of e-h ensembles. In this talk, I will talk
about the frontier of PIPT and DYCE (dynamically-correlated electron)
optical physics.