三维量子点的三电子系统

由量子力学对称性研究了三维量子点三电子系统的结构，指出了存在“幻数”的可能性，并与二维量子点三电子系统的“幻数”特征作了比较．在有效质量近似下，计算了抛物阱（?ω₀=2meV）三电子系统的能谱．结果表明在三维三电子量子点中存在“幻数”的迹象，但很少．理论分析和计算结果都表明三维量子点三电子系统的基态是1^-态 关键词：     

Second Bound State of Biexcitons in Quantum Dots

The second bound state of the biexcitons in a quantum dot,with orbital angular moentum L=1,is reported.BY using the method of few-body physics,the binding energy spectra of the second bound state of a biexciton in a GaAs quantum dot with a parabolic confinement have been calculated as a function of the electron-to-hole mass ratio and the quantum dot size.The fact that the biexcitions have a second bound state may aid in the better understanding of their binding mechanism.     

量子点电子态的尺寸效应和磁场的影响

在有效质量近似下，使用少体物理的方法，计算了在不同大小约束势情况下二维量子点三电子系统的自旋极化态的能谱.结果显示幻数角动量是否出现，主要取决于量子力学对称性、约束势大小及磁场的强度. 关键词：     

分子团簇Kr3低激发能谱和内部运动

采用少体物理方法，计算了惰性元素三分子团簇Ｋｒ３的低激发能谱，分析量子力学对称性对Ｋｒ３的几何结构和内部运动影响，给出Ｋｒ３代激发能谱的几条与Ｎｅ３和Ａｒ３低激发能谱中完全相似的转动带。发现量子数Ｑ有可能近似地作为一个好量子数，来对惰性三分子团的低激发谱进行分类。     

三粒子系统的“Q效应”

采用不同的模型，揭示三粒子系统内部振动能和集体转动能的竞争对系统组态的几何结构和空间取向的影响.     

~（12）C基态和低激发态微观结构的对称性分析

通过３ａ集团模型，对１２Ｃ的基态和低激发态的微观结构进行对称性分析，得到一些令人感兴趣的结果．     

NEGATIVE DONOR CENTER QUANTUM DOTS IN MAGNETIC FIELDS

The method of few-body physics is applied to treat a D^{-<\sup> center quantum dot system in a magnetic field. The magnetic field is applied in the z direction. Using this method, we investigate the energy spectra of low-lying states of D-<\sup> center quantum dots as a function of magnetic field. The dependence of the binding energies of the ground-state of the D-<\sup> center are calculated as a function of the dot radius with a few values of the magnetic field strength and compared with other results.}     

THREE-ELECTRON SYSTEMS IN SPHERICAL PARABOLIC GaAs QUANTUM DOTS

By making use of the method of few-body physics,the energy spectra of low-lying states of a three-electron spherical dot have been calculated. The quantum-size effects on the energy spectra of three electrons are shown.The res ults show that the orders of energy levels do not change when quantum dot diamet ers change.As a result, the energies of the states of L=3k?(k=1,2,…)ful filling π (-1)^L=1 are lower than those of their adjacent states.     

An Exciton bound to a Neutral Donor in Quantum Dots

The binding energies for an exciton(X) trapped in a two-dimensional quantum dot by a neutral donor have been calculated using the method of few-body physics for the heavy hole(σ=0.196) and the light hole (σ=0.707).We find that the (D^0,X) complex confined in a quantum dot has in general a larger binding energy than those in a two-dimensional quantum well and a three-dimensional bulk semiconductor,and the binding energy than those in a two-dimensional quantum well and a three-dimensional bulk semiconductor,and the binding energy increases with the decrease of the dot radius.At dot radius R→∞,we compare our calculated result with the previous results.     

量子盘三电子系统的基态性质

用少体物理的方法，研究了磁场中量子盘三电子系统极化态的基态能量和盘厚之间的关系.随着量子盘厚度的增加，三电子系统中的幻数角动量态即分数量子霍耳效应态将不再出现.结果还表明，幻数角动量消失的量子盘厚度随磁场强度的增加而减小. 关键词：