圆柱状量子点量子导线复合系统的激子能量和电子概率分布  

Energy of excitons and probability distribution of electrons in columned composite system composed of quantum dots and quantum wires

作　　者：郑瑞伦[1] 

机构地区：[1]重庆文理学院物理与信息工程系,重庆402160

出　　处：《物理学报》2007年第8期4901-4907,共7页Acta Physica Sinica

摘　　要：建立了圆柱状量子点量子导线复合系统中激子满足的方程,用微扰论求出激子能量.以CdS/HgS/CdS/HgS/CdS圆柱状量子点量子导线复合系统为例,研究了系统中电子的概率分布和系统线度对激子能量的影响.结果表明:系统中电子、空穴以及激子的能量均随量子点高度h0的增大而减小,电子-空穴相互作用对基态激子能量的影响要大于激发态;电子沿径向方向的概率分布呈起伏状,在轴线和表面附近的概率趋于零,而在R/2附近概率最大;在量子点附近电子沿轴向方向的概率分布呈振荡特征.Equations of excitons in columned composite systems composed of quantum dots and quantum wires have been formulated. Then the energy of excitons is solved by the perturbation theory. From the example of CdS/HgS/CdS/HgS/CdS columned composite systems composed of quantum dots and quantum wires, the electric probability distribution in this system and the dependence of energy of excitons on the size of system are studied. The results show that ： （1） The energies of electrons, holes and excitions in this system all decrease as the height, h0, of quantum dots increases and the impact of the interaction of electrons holes to the energies of the ground excitons is greater than that of the excitons. （2） The probability distribution of the electrons is undulating in the ridial direction, and the probability tends to zero on the axis and near the surface and is maximal near R/2. The probability distribution of electrons is vibratory near the quantum dots in the axial direction.

关 键 词：量子点 量子导线 激子 能量 

分 类 号：O471.3[理学—半导体物理]