Band-gap renormalization in quantum wire systems: dynamical correlations and multi-subband effects

Citation
K. Guven et al., Band-gap renormalization in quantum wire systems: dynamical correlations and multi-subband effects, J PHYS-COND, 12(9), 2000, pp. 2031-2042
Citations number
45
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF PHYSICS-CONDENSED MATTER
ISSN journal
09538984 → ACNP
Volume
12
Issue
9
Year of publication
2000
Pages
2031 - 2042
Database
ISI
SICI code
0953-8984(20000306)12:9<2031:BRIQWS>2.0.ZU;2-J
Abstract
We study the band-gap renormalization in a model semiconductor quantum wire due to the exchange-correlation effects among the charge carriers. We cons truct a two-subband model for the quantum wire, and employ the GW-approxima tion to obtain the renormalized quasi-particle energies at the optical band edge. The renormalization is calculated as a function of electron-hole pla sma density and the wire radius. Our results show that the very presence of the second subband affects the renormalization process even in the absence of occupation by the carriers. We compare the fully dynamical random-phase approximation results to the quasi-static case in order to emphasize the d ynamical correlation effects. Effects of electron-phonon interaction within the two-subband model are also considered.