中国物理B ›› 2011, Vol. 20 ›› Issue (2): 27302-027302.doi: 10.1088/1674-1056/20/2/027302

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Electronic structures of stacked layers quantum dots: influence of the non-perfect alignment and the applied electric field

贾博雍, 俞重远, 刘玉敏, 韩利红, 姚文杰, 冯昊, 叶寒   

  1. Key Laboratory of Information Photonics and Optical Communications (Ministry of Education), Beijing University of Posts and Telecommunications, Beijing 100876, China
  • 收稿日期:2010-09-10 修回日期:2010-09-25 出版日期:2011-02-15 发布日期:2011-02-15
  • 基金资助:
    Project supported by the National High Technology Research and Development Program of China (Grant No. 2009AA03Z405), the National Natural Science Foundation of China (Grant Nos. 60908028 and 60971068), and the Fundamental Research Funds for the Central Universities (Grant No. BUPT2009RC0411).

Electronic structures of stacked layers quantum dots: influence of the non-perfect alignment and the applied electric field

Jia Bo-Yong(贾博雍),Yu Zhong-Yuan(俞重远)†, Liu Yu-Min(刘玉敏), Han Li-Hong(韩利红), Yao Wen-Jie(姚文杰),Feng Hao(冯昊),and Ye Han (叶寒)   

  1. Key Laboratory of Information Photonics and Optical Communications (Ministry of Education), Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2010-09-10 Revised:2010-09-25 Online:2011-02-15 Published:2011-02-15
  • Supported by:
    Project supported by the National High Technology Research and Development Program of China (Grant No. 2009AA03Z405), the National Natural Science Foundation of China (Grant Nos. 60908028 and 60971068), and the Fundamental Research Funds for the Central Universities (Grant No. BUPT2009RC0411).

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摘要： Electronic structures of the artificial molecule comprising two truncated pyramidal quantum dots vertically coupled and embedded in the matrix are theoretically analysed via the finite element method. When the quantum dots are completely aligned, the electron energy levels decrease with the horizontally applied electric field. However, energy levels may have the maxima at non-zero electric field if the dots are staggered by a distance of several nanometers in the same direction of the electric field. In addition to shifting the energy levels, the electric field can also manipulate the electron wavefunctions confined in the quantum dots, in company with the non-perfect alignment.

Abstract: Electronic structures of the artificial molecule comprising two truncated pyramidal quantum dots vertically coupled and embedded in the matrix are theoretically analysed via the finite element method. When the quantum dots are completely aligned, the electron energy levels decrease with the horizontally applied electric field. However, energy levels may have the maxima at non-zero electric field if the dots are staggered by a distance of several nanometers in the same direction of the electric field. In addition to shifting the energy levels, the electric field can also manipulate the electron wavefunctions confined in the quantum dots, in company with the non-perfect alignment.

Key words: electronic structure, quantum dot, non-perfect alignment, electric field

中图分类号:  (Quantum dots)

  • 73.21.La
73.63.Kv (Quantum dots)