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Chin. Phys. B, 2011, Vol. 20(3): 037301    DOI: 10.1088/1674-1056/20/3/037301

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

Zhai Li-Xuea, Liu Jian-Juna, Zhang Hongb, Wang Xueb, Zhang Chun-Yuanb
a College of Physics Science and Information Engineering, Hebei Nornal University, Shijiazhuang, Hebei 050016, China; b College of Science, Hebei University of Engineering, Handan, Heibei 056038, China
Abstract  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.
Keywords:  binding energy      hydrogenic impurity      quantum dot  
Received:  22 August 2010      Revised:  19 October 2010      Published:  15 March 2011
PACS:  73.20.Hb (Impurity and defect levels; energy states of adsorbed species)  
  73.21.La (Quantum dots)  
  73.40.Kp (III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10674040) and the Natural Science Foundation of Hebei Province, China (Grant No. A2007000233).

Cite this article: 

Zhang Hong, Zhai Li-Xue, Wang Xue, Zhang Chun-Yuan, Liu Jian-Jun Impurity-related electronic properties in quantum dots under electric and magnetic fields 2011 Chin. Phys. B 20 037301

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