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Polaronic Effects of an Exciton in a Cylindrical Quantum Wire
Ist Teil von
Communications in theoretical physics, 2005-01, Vol.43 (1), p.169-174
Ort / Verlag
IOP Publishing
Erscheinungsjahr
2005
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The effects of exciton-optical phonon interaction on the binding energy and the total and reduced effective masses of an exciton in a cylindrical quantum wire have been investigated. We adopt a perturbative-PLL [T.D. Lee, F. Low, and D. Pines, Phys. Rev. B90 (1953) 297] technique to construct an effective Hamiltonian and then use a variational solution to deal with the exciton-phonon system. The interactions of exciton with the longitudinal-optical phonon and the surface-optical phonon have been taken into consideration. The numerical calculations for GaAs show that the influences of phonon modes on the exciton in a quasi-one-dimensional quantum wire are considerable and should not be neglected. Moreover the numerical results for heavy- and light-hole exciton are obtained, which show that the polaronic effects on two types of excitons are very different but both depend heavily on the sizes of the wire.