Quantum and Spontaneous Breakage of Translational Symmetry due to Light Excitation in Photo-Induced Structural Phase Transitions

• Authors: K. Nasu
• Languages of publication: EN

Abstracts

EN

Real time quantum dynamics of the spontaneous translational symmetry breakage due to light excitation in the early stage of photo-induced structural phase transitions is reviewed under the guide of the Toyozawa theory, which is in exact compliance with the conservation law of the total momentum. At the Franck-Condon state, an electronic excitation just created by a visible photon is in a plane wave state, extended all over the crystal. While, after the lattice relaxation having been completed, it is localized as a new excitation. So, is there the shrinkage of the excitation wave function? No! The wave function never shrinks, but only the spatial (or inter lattice-site) quantum coherence (interference) of the excitation disappears, as the lattice relaxation proceeds. This is the breakage of translational symmetry.

Keywords

EN

78.90.+t

Discipline

• 78.90.+t: Other topics in optical properties, condensed matter spectroscopy and other interactions of particles and radiation with condensed matter (restricted to new topics in section 78)

• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 2
• Pages: 347-349

Dates

published

2012-02

Contributors

author

K. Nasu

• Institute of Material Structure Science, KEK, 1-1, Oho, Tsukuba, 305-0801, Japan

References

• [1] Y. Toyozawa, J. Phys. Soc. Jpn. 58, 2626 (1989)
• [2] Y. Shinozuka, Y. Toyozawa, J. Phys. Soc. Jpn. 46, 505 (1979)
• [3] K. Cho, Y. Toyozawa, J. Phys. Soc. Jpn. 30, 1555 (1971)

Identifiers

DOI

10.12693/APhysPolA.121.347