HYDROGENIC IMPURITY BINDING ENERGY IN GaAs QUANTUM RINGS

作者：Wang, Guang-Xin^*; Zhang, Peng

来源：International Journal of Modern Physics B, 2011, 25(32): 4687-4695.

DOI：10.1142/S0217979211052381

• Quantum ring
• hydrogenic impurity
• binding energy

Using a variational approach within the effective-mass approximation, we investigate the ground-state binding energy of a donor impurity in the GaAs quantum rings (QR) in the infinite confinement potential. A trial wave function with two variational parameters is used in the calculation. The binding energy as a function of the QR structure parameters and the impurity position is investigated. The results indicate that the binding energy decreases gradually as the QR structure parameters increase in the infinite confinement potential. In addition, the binding energy of the impurity exhibits a maximum as the impurity position moves along the symmetry axis of the QR from the bottom of the QR to the top. The impurity binding energy firstly increases and then decreases as the impurity moves from the internal surface of the QR to the external surface, indicating that there is a maximum.

• 出版日期2011-12-30
• 单位中国石油大学（北京）