Electron-Phonon Interaction in an Annular Quantum Dot

被引：0
|
作者：
WU Bo XIE Hong-Jing School of Physics and Electronic Engineering
机构：
来源：
Communications in Theoretical Physics | 2008年 / 49卷 / 02期
关键词：
dielectric continuum approximation; phonon modes; electron-phonon interaction; annular; quantum dots;
D O I：
暂无
中图分类号：
O471.1 [半导体量子理论];
学科分类号：
070205 ; 080501 ; 0809 ; 080903 ;
摘要：
The confined longitudinal-optical (LO) phonon and surface-optical (SO) phonon modes of a free-standingannular cylindrical quantum dot are derived within the framework of dielectric continuum approximation.It is foundthat there exist two types of SO phonon modes:top SO (TSO) mode and side SO(SSO) mode in a cylindrical quantumannulus.Numerical calculation on CdS annulus system has been performed.Results reveal that the two differentsolutions of SSO mode distribute mainly at the inner or outer surfaces of the annulus.The dispersion relations and thecoupling intensions of phonons in a quantum annulus are compared with those in a cylindrical quantum dot.It is foundthat the dispersion relations of the two different structures are similar,but the coupling intension of the phonon-electroninteraction in quantum annulus is larger than that in quantum dot.The Hamiltonians describing the free phonon modesand their interactions with electrons in the system are also derived.
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页码：493 / 503
页数：11
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