Open AccessInfluences of temperature and polaron effect on the ground state of quasi-two-dimensional strong-coupling exciton
Author(s) -
Eerdunchaolu
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.416
Subject(s) - polaron , exciton , phonon , ground state , condensed matter physics , physics , coupling (piping) , quantum well , materials science , atomic physics , quantum mechanics , electron , metallurgy , laser
The influences of temperature and polaron effect on the ground state of the systemfor which the exciton is strongly coupled with interface-optical (IO) phonons but weakly coupled with bulk-longitudinal-optical (LO) phonons in a quantum well, are studied by using the Huybrechts' linear-combination operator and Lee-Low-Pines (LLP) transformation method. The expressions for the induced potential and energy shift of the ground state of the exciton were derived. Numerical calculations for AgCl/AgBr QW, as an example, are performed. The result indicates that the induced potential and the energy shift increases for strong exciton-IO-phonon coupling but decreases for weak exciton-LO-phonon coupling with temperature.