Photoinduced Structural Phase Transitions in Polyacene

Details Photoinduced Structural Phase Transitions in Polyacene Photoinduced Structural Phase Transitions in Polyacene

2011-06-21

arxiv.org/abs/1106.4158v1

J. Phys. Soc. Jpn. 80, No. 8 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages with 15 figures embedded

Scientific paper

There exist two types of structural instability in polyacene: double bonds in a cis pattern and those in a trans pattern. They are isoenergetic but spectroscopically distinct. We demonstrate optical characterization and manipulation of Peierls-distorted polyacene employing both correlated and uncorrelated Hamiltonians. We clarify the phase boundaries of the cis- and trans-distorted isomers, elucidate their optical-conductivity spectra, and then explore their photoresponses. There occurs a photoinduced transformation in the polyacene structure, but it is one-way switching: The trans configuration is well convertible into the cis one, whereas the reverse conversion is much less feasible. Even the weakest light irradiation can cause a transition of uncorrelated electrons, while correlated electrons have a transition threshold against light irradiation.

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