Impurity-related electronic properties in quantum dots under electric and magnetic fields

Hong Zhang, Li-Xue Zhai, Xue Wang, Chun-Yuan Zhang, Jian-Jun Liu
2011 Chinese Physics B  
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 effectivemass approximation. The variation of the binding energy with the lateral confinement, external field, position of the impurity, and quantum-size is
more » ... ied 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.
doi:10.1088/1674-1056/20/3/037301 fatcat:7r22ggri5bgkxcuphwylyfstfm