量子点中受离子掺杂激子束缚态的稳定性
材料科学
2009-11-07 v1
摘要
利用全能量、束缚能和电子空穴对复合物的复合速率,计算了沿 z 轴距离 d 位于量子点平面上的掺杂杂质所引起的二维抛物面量子点中激子(X)的束缚态。采用最近发展的数值方法(PMM)求解 Schrodinger 方程。分析表明,当量子点半径小于临界值时,复合物不稳定;随着杂质距离的增加,临界半径也随之增大。此外,存在一个质量比的临界值,当质量比小于该临界值时,复合物稳定。这种稳定性条件同时取决于杂质距离和量子点半径:随着杂质距离的增加,出现该稳定性条件的最大量子点半径也随之增大。对于半径大于该最大半径(在固定杂质距离下)的量子点,复合物始终稳定。
引用
@article{arxiv.cond-mat/0211329,
title = {Stability of an Exciton bound to an Ionized Donor in Quantum Dots},
author = {S. Baskoutas and W. Schommers and A. F. Terzis and V. Kapaklis and M. Rieth and C. Politis},
journal= {arXiv preprint arXiv:cond-mat/0211329},
year = {2009}
}
备注
17 pages, 7 figures Applying a new numerical method which is based on the adiabatic stability of quantum mechanics, we study the stability of an exciton (X) bound in a parabolic two dimensional quantum dot by a donor impurity located on the z axis at a distance d from the dot plane