Localization versus delocalization in simple two-state models: variational estimates

We study a two-level system coupled to the set of harmonic oscillators by application of a simple variational approach whose equations can in principle be solved in the whole range of system parameters. The conditions for localization are studied for the molecular crystal model and the acoustic defo...

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Bibliographic Details
Published in:Physics letters. A 1993, Vol.172 (6), p.461-466
Main Authors: Ivić, Z., Kapor, D., Vujičić, G., Tančić, A.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Exact sciences and technology
Physics
Surface and interface electron states
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Summary:We study a two-level system coupled to the set of harmonic oscillators by application of a simple variational approach whose equations can in principle be solved in the whole range of system parameters. The conditions for localization are studied for the molecular crystal model and the acoustic deformation potential model.
ISSN:0375-9601
1873-2429
DOI:10.1016/0375-9601(93)90240-Z