9 February 1995 Exciton self-trapping processes
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Proceedings Volume 2362, International Conference on Excitonic Processes in Condensed Matter; (1995) https://doi.org/10.1117/12.200973
Event: Excitonic Processes in Condensed Matter: International Conference, 1994, Darwin, Australia
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.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
St. Georgiev, Lyubomir Mihailov, and Jai Singh "Exciton self-trapping processes", Proc. SPIE 2362, International Conference on Excitonic Processes in Condensed Matter, (9 February 1995); doi: 10.1117/12.200973; https://doi.org/10.1117/12.200973

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