中国物理B ›› 2004, Vol. 13 ›› Issue (6): 942-947.doi: 10.1088/1009-1963/13/6/027

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Effects of a donor on the bond property of quantum-dot molecules

罗莹1, 马本堃1, 段素青2, 赵宪庚2, 王立民3   

  1. (1)Department of Physics and Institute of Theoretical Physics, Beijing Normal University, Beijing 100875, China; (2)Institute of Applied Physics and Computational Mathematics, Beijing 100088, China; (3)Institute of Applied Physics and Computational Mathematics, Beijing 100088, China; Department of Physics, Hebei Normal University, Shijiazhuang 050091, China
  • 收稿日期:2003-10-16 修回日期:2004-02-03 出版日期:2004-07-05 发布日期:2005-07-05
  • 基金资助:
    Project supported in part by the National Natural Science Foundation of China (Grant Nos 10274007 and 90103027), and in part by the Doctoral Research Fund of Hebei Normal University.

Effects of a donor on the bond property of quantum-dot molecules

Wang Li-Min (王立民)ab, Luo Ying (罗莹)c, Ma Ben-Kun (马本堃)c, Duan Su-Qing (段素青)a, Zhao Xian-Geng (赵宪庚)a    

  1. a Institute of Applied Physics and Computational Mathematics, Beijing 100088, China; b Department of Physics, Hebei Normal University, Shijiazhuang 050091, China; c Department of Physics and Institute of Theoretical Physics, Beijing Normal University, Beijing 100875, China
  • Received:2003-10-16 Revised:2004-02-03 Online:2004-07-05 Published:2005-07-05
  • Supported by:
    Project supported in part by the National Natural Science Foundation of China (Grant Nos 10274007 and 90103027), and in part by the Doctoral Research Fund of Hebei Normal University.

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摘要： Within the framework of effective mass approximation, we have calculated the electronic structure of the two laterally coupled quantum dots with a donor by the finite element method. The calculated results show that the bond states of quantum-dot molecules are quite sensitive to the donor positions. By varying the donor position, the transition from covalent to ionic bond state is realized for some electronic states. Some extreme cases are also discussed for comparison.

关键词: covalent bond, ionic bond, wave function, energy level

Abstract: Within the framework of effective mass approximation, we have calculated the electronic structure of the two laterally coupled quantum dots with a donor by the finite element method. The calculated results show that the bond states of quantum-dot molecules are quite sensitive to the donor positions. By varying the donor position, the transition from covalent to ionic bond state is realized for some electronic states. Some extreme cases are also discussed for comparison.

Key words: covalent bond, ionic bond, wave function, energy level

中图分类号:  (Quantum dots)

  • 73.21.La
02.70.Dh (Finite-element and Galerkin methods) 71.55.Ht (Other nonmetals)