HYDROGENIC IMPURITY STATES IN WURTZITE ZnO/MgZnO QUANTUM DOT

作者：Zeng, Zaiping^*; Wei, Shuyi; Wei, Jingbo

来源：Modern Physics Letters B, 2010, 24(28): 2793-2801.

DOI：10.1142/S0217984910025061

• Quantum dot
• hydrogenic impurity
• binding energy

Based on the effective-mass approximation, considering the built-in electric field effect due to the spontaneous and piezoelectric polarizations, the ground-state donor binding energy of a hygrogenic impurity in a cylindrical wurzite (WZ) ZnO/MgZnO strained quantum dot (QD) is investigated variationally. Numerical results show that the ground-state donor binding energy is highly dependent on the Mg composition, the impurity positions and the QD size. The built-in electric field also induces an asymmetric distribution of the ground-state donor binding energy with respect to the center of the QD. In particular, it is found that the ground-state donor binding energy is insensible to the dot height when the impurity is located at the right boundary of the WZ ZnO/MgZnO strained QD if the dot height is large.

• 出版日期2010-11-10
• 单位河南师范大学