Interplay between Coulomb interaction and quantum-confined Stark-effect in polar and nonpolar wurtzite InN/GaN quantum dots
Interplay between Coulomb interaction and quantum-confined Stark-effect in polar and nonpolar wurtzite InN/GaN quantum dots
复制标题
DOI：
10.1140/epjb/e2013-40542-0
复制
发表时间：
2013-11-01
影响因子：
1.6
通讯作者：
Czycholl, Gerd
中科院分区：
文献类型：
--
作者：
Barthel, Stefan;Schuh, Kolja;Czycholl, Gerd
本文系统地分析了极性和非极性纤锌矿-InN/GaN量子点的电子结构及其由于本征场引起的量子限制Stark效应而引起的电子结构变化。这是通过将连续弹性理论与有效键轨道模型相结合来描述这些氮化物系统中的弹性和单粒子电子性质来实现的。在此基础上，采用多体处理方法确定了光吸收谱。光学跃迁的效率取决于库仑相互作用和量子限制斯塔克效应之间的相互作用。我们引入了一个有效的限制势，它代表了电子结构的影响下的固有极化场和计算所需的库仑相互作用的强度，以减少电子和空穴的分离。
In this paper we systematically analyze the electronic structures of polar and nonpolar wurtzite-InN/GaN quantum dots and their modification due to the quantum-confined Stark effect caused by intrinsic fields. This is achieved by combining continuum elasticity theory with an effective-bond orbital model to describe the elastic and single-particle electronic properties in these nitride systems. Based on these results, a many-body treatment is used to determine optical absorption spectra. The efficiency of optical transitions depends on the interplay between the Coulomb interaction and the quantum-confined Stark effect. We introduce an effective confinement potential which represents the electronic structure under the influence of the intrinsic polarization fields and calculate the needed strength of Coulomb interaction to diminish the separation of electrons and holes.