Theory of Photoinduced Phase Transitions

Details Theory of Photoinduced Phase Transitions Theory of Photoinduced Phase Transitions

2005-11-05

arxiv.org/abs/cond-mat/0511137v1

J. Phys. Soc. Jpn. 75, 011008 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 9 figures, to appear in J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.75.011008

Theories of photoinduced phase transitions have developed along with the progress in experimental studies, especially concerning their nonlinear characters and transition dynamics. At an early stage, paths from photoinduced local structural distortions to global ones are explained in classical statistical models. Their dynamics are governed by transition probabilities and inevitably stochastic, but they were sufficient to describe coarse-grained time evolutions. Recently, however, a variety of dynamics including ultrafast ones are observed in different electronic states. They are explained in relevant electronic models. In particular, a coherent lattice oscillation and coherent motion of a macroscopic domain boundary need appropriate interactions among electrons and lattice displacements. Furthermore, some transitions proceed almost in one direction, which can be explained by considering relevant electronic processes. We describe the history of theories of photoinduced phase transitions and discuss a future perspective.

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