Premium
Local phonons in crystals with electron centres
Author(s) -
Lakhno V. D.,
Chuev G. N.
Publication year - 1989
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.2221520109
Subject(s) - phonon , excited state , polaron , adiabatic process , condensed matter physics , physics , jahn–teller effect , electron , atomic physics , adiabatic theorem , quantum mechanics , ion
The changes are investigated in the phonon spectrum for the F‐centre in the presence of excess electron. The frequencies of local phonons for the ground and the first excited self‐consistent states of the F‐centre in KC1 are calculated. The adiabatic approximation is used to determine a secondorder correction to the energy for self‐consistent states in the F‐centre. As a limit the resting polaron is considered. For excited self‐consistent states local modes are found with frequencies larger than in optical phonons. It is also found that excited self‐consistent states of the polaron show a phonon (pseudo Jahn‐Teller) instability.