Title
Extended stability region for large bipolarons through interaction with multiple phonon branches Extended stability region for large bipolarons through interaction with multiple phonon branches
Author
Faculty/Department
Faculty of Sciences. Physics
Faculty of Social Sciences. Sociology
Publication type
article
Publication
London ,
Subject
Physics
Source (journal)
Ferroelectrics. - London
Volume/pages
130(1992) :1-3 , p. 27-34
ISSN
0015-0193
ISI
A1992JV42600004
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The large (bi)polaron is investigated for the case where the electron interacts with multiple LO-phonon branches. Explicit expressions for the groundstate energy and the effective mass are obtained within the Feynman polaron model approximation and they are applied to the material SrTiO3. The results of an effective LO-phonon branch approximation are compared with the results in which all LO-phonon branches are explicitly included. We show how the stability region for large bipolaron formation is enlarged when the electrons interact with multiple LO-phonon branches. The possible relevance of this result for the high-T(c) superconductors is pointed out.
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