Size Effect of a Negatively Charged Exciton in a Two-Dimensional Quantum Dot

作者：Liu Chao^*; Xie Wen Fang

来源：Communications in Theoretical Physics, 2009, 51(2): 353-357.

DOI：10.1088/0253-6102/51/2/33

• quantum dot
• charged exciton
• size effect
• energy spectrum
• symmetry

In this paper we study a negatively charged exciton (NCE), which is trapped by a two-dimensional (2D) parabolic potential. By using matrix diagonalization techniques, the correlation energies of the low-lying states with L = 0, 1, and 2 are calculated as a function of confinement strength. We find that the size effects of different states are different. This phenomenon can be explained as a hidden symmetry, which is originated purely from symmetry. Based on symmetry, the features of the low-lying states are discussed in the influence of the 2D parabolic potential well. It is found that the confinement may cause accidental degeneracies between levels with different low-excited states. It is shown that the effect of quantum confinement on the binding energy of the heavy hole is stronger than that of a light hole.

• 出版日期2009-2
• 单位广州大学