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Proceedings Paper

Exciton self-trapping processes
Author(s): St. Georgiev; Lyubomir Mihailov; Jai Singh
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Paper Abstract

Small-radius Frenkel excitons coupled with phonons can have diverse configurational structures depending on the symmetry of the electronic states involved and that of the associated modes of the inter-ionic/molecular vibrations. It is considered here that the symmetric excitons arise from the coupling with symmetry-retaining vibrational modes and vibronic excitons from the coupling to symmetry-breaking modes. Three examples are discussed: (1) formation of the barriers of exciton self trapping, as it occurs in the dimer formation at semiconductor surfaces, (2) parity breaking that occurs at a centrosymmetric site and leads to an inversion electric dipole which enhances the polarizability and binding energy for pairing vibronic excitons, and (3) a Bose condensation model of quasi-2D excitons applicable to the layered materials.

Paper Details

Date Published: 9 February 1995
PDF: 14 pages
Proc. SPIE 2362, International Conference on Excitonic Processes in Condensed Matter, (9 February 1995); doi: 10.1117/12.200973
Show Author Affiliations
St. Georgiev, Institute of Solid State Physics (Bulgaria)
Lyubomir Mihailov, Institute of Solid State Physics (Bulgaria)
Jai Singh, Northern Territory Univ. (Australia)

Published in SPIE Proceedings Vol. 2362:
International Conference on Excitonic Processes in Condensed Matter
Jai Singh, Editor(s)

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