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1995 | 87 | 1 | 47-56
Article title

Excitonic Instabilities of Deformable Lattice - from Self-Trapping to Phase Transition

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EN
Abstracts
EN
The optically created exciton will be self-trapped if its coupling to phonons is strong enough, and will moreover be self-decomposed if the elec­tron and the hole couple to phonons in an opposite way. The bistability between the parity-conserved and parity-broken self-trapped excitons was observed in alkali halides. The situation is most dramatic if the bistability between the parity-broken self-trapped exciton and the ground state (with no exciton) comes into play since the electron-hole pairs may then be sponta­neously generated at every lattice site, resulting in the electronic and struc­tural phase transition. The neutral to ionic phase transition observed in a few organic charge transfer compounds under applied pressure or decreasing tem­perature can be considered as an example. Recent experiment revealed that TTF-chloranil, among others, is subject to photo-induced transient phase change over hundreds of unit cells per one photon. The dynamics of this process can be described in terms of self-trapping and self-multiplication of a photo-generated charge transfer exciton along the chain through the at­tractive dipolar interaction. This description of phase transition in terms of exciton dynamics will provide a new paradigm of materiology.
Keywords
EN
Year
Volume
87
Issue
1
Pages
47-56
Physical description
Dates
published
1995-01
References
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv87z105kz
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