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Polarons in the Degenerate‐Band Case
Author(s) -
Trebin H.R.,
Rössler U.
Publication year - 1975
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220700232
Subject(s) - polaron , degenerate energy levels , condensed matter physics , renormalization , physics , perturbation theory (quantum mechanics) , electron , valence band , electronic band structure , perturbation (astronomy) , quantum mechanics
The Fröhlich polaron model has been applied so far only to the case of electron states with simple parabolic bands. An extension is given of the polaron concept to more complex states as e.g. the valence bands in zincblende‐type crystals. The band structure is described as in the spherical model of Baldereschi and Lipari. The electron‐phonon interaction in the Fröhlich approximation is treated by perturbation theory. Besides a renormalization of the band parameters the electron‐phonon coupling results in a partial mixing of electronic states from different subbands, i.e. of light and heavy holes.