%A Zhang Hong(张红), Zhai Li-Xue(翟利学), Wang Xue(王学), Zhang Chun-Yuan(张春元), and Liu Jian-Jun(刘建军) %T Impurity-related electronic properties in quantum dots under electric and magnetic fields %0 Journal Article %D 2011 %J Chin. Phys. B %R 10.1088/1674-1056/20/3/037301 %P 37301-037301 %V 20 %N 3 %U {https://cpb.iphy.ac.cn/CN/abstract/article_112706.shtml} %8 2011-03-15 %X This paper presents a systematic study of the ground-state binding energies of a hydrogenic impurity in quantum dots subjected to external electric and magnetic fields. The quantum dot is modeled by superposing a lateral parabolic potential, a Gaussian potential and the energies are calculated via the finite-difference method within the effective-mass approximation. The variation of the binding energy with the lateral confinement, external field, position of the impurity, and quantum-size is studied in detail. All these factors lead to complicated binding energies of the donor, and the following results are found: (1) the binding energies of the donor increase with the increasing magnetic strength and lateral confinement, and reduce with the increasing electric strength and the dot size; (2) there is a maximum value of the binding energies as the impurity placed in different positions along the z direction; (3) the electric field destroys the symmetric behaviour of the donor binding energies as the position of the impurity.