广州大学学报（自然科学版）
廣州大學學報（自然科學版）
엄주대학학보（자연과학판）
JOURNAL OF GUANGZHOU UNIVERSITY(NATURAL SCIENCE EDITION)
2007年
2期
1-5
,共5页
双激子%量子点%粒子关联
雙激子%量子點%粒子關聯
쌍격자%양자점%입자관련
biexciton%quantum dot%particle correlation
采用精确对角化方法,研究了限制在半导体量子点中双激子的量子尺寸效应.计算了双激子量子点的基态和低激发态的关联能随限制强度大小变化的关系,揭示了双激子量子点的基态和低激发态能谱的重要性质.我们发现随着限制强度的增加,双激子量子点的基态和低激发态的关联能变化是不同的;我们还发现限制可以引起不同低激发态能级的偶然简并和能级的反转.这些性质都与系统的交换和旋转对称性有关.
採用精確對角化方法,研究瞭限製在半導體量子點中雙激子的量子呎吋效應.計算瞭雙激子量子點的基態和低激髮態的關聯能隨限製彊度大小變化的關繫,揭示瞭雙激子量子點的基態和低激髮態能譜的重要性質.我們髮現隨著限製彊度的增加,雙激子量子點的基態和低激髮態的關聯能變化是不同的;我們還髮現限製可以引起不同低激髮態能級的偶然簡併和能級的反轉.這些性質都與繫統的交換和鏇轉對稱性有關.
채용정학대각화방법,연구료한제재반도체양자점중쌍격자적양자척촌효응.계산료쌍격자양자점적기태화저격발태적관련능수한제강도대소변화적관계,게시료쌍격자양자점적기태화저격발태능보적중요성질.아문발현수착한제강도적증가,쌍격자양자점적기태화저격발태적관련능변화시불동적;아문환발현한제가이인기불동저격발태능급적우연간병화능급적반전.저사성질도여계통적교환화선전대칭성유관.
A biexciton confined in a quantum dot has been investigated. The correlation energy of a biexciton is calculated as a function of the confinement strength by using exact diagonalization techniques. The important feature of the low-lying states of the biexciton in a quantum dot is obtained. We find that as the confinement strength increases, the energy variations of the ground and low-lying states are different. We also find that the confinement may cause accidental degeneracies between levels with different quantum numbers and the inversion of the energy values. These are connected to the exchange and rotational symmetries of the systems.
