Mean-Field Theory of Photo-Induced Structural Phase Transitions
Abstract
A photoinduced structure change is treated as a nonequilibrium phase transition to investigate its switching dynamics and threshold behavior. To this end, the mean-field theory of the photoinduced structural phase transition is developed to clarify how local microscopic structural distortions in each molecule lead cooperatively to a global macroscopic structure change in many-molecule systems. A three-dimensional long(infinite)-range intersite coupling between the local distortions plays a crucial role in inducing threshold behaviors to bring about the nonlinearity inhered in the system. Dependence of the switching dynamics on optical pumping and temperature is clarified, and the time-resolved emission spectra are also calculated with this model.
Keywords
Ising Model Spontaneous Emission Switching Dynamic Nonequilibrium Phase Transition Structural SwitchingPreview
Unable to display preview. Download preview PDF.
References
- [1]Optical Properties of Low-Dimensional Materials, edited by T. Ogawa and Y. Kanemitsu (World Scientific, Singapore, 1995).Google Scholar
- [2]E. Hanamura and N. Nagaosa, J. Phys. Soc. Jpn. 56, 2080 (1987).ADSCrossRefGoogle Scholar
- [3]N. Nagaosa and T. Ogawa, Phys. Rev. B 39, 4472 (1989).ADSGoogle Scholar
- [4]J. D. Gunton and M. Droz, Introduction to the Theory of Metastable and Unstable States (Springer-Verlag, Berlin, 1983).CrossRefGoogle Scholar