Donor-bound electron states in a two-dimensional quantum ring under uniform magnetic field

doi:10.1088/1674-1056/20/6/067301

中国物理B ›› 2011, Vol. 20 ›› Issue (6): 67301-067301.doi: 10.1088/1674-1056/20/6/067301

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

Donor-bound electron states in a two-dimensional quantum ring under uniform magnetic field

贾博雍, 俞重远, 刘玉敏, 韩利红, 姚文杰, 冯昊, 叶寒

Key Laboratory of Information Photonics and Optical Communications (Ministry of Education), Beijing University of Posts and Telecommunications, Beijing 100876, China

收稿日期:2010-10-14 修回日期:2011-01-18 出版日期:2011-06-15 发布日期:2011-06-15
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).

Donor-bound electron states in a two-dimensional quantum ring under uniform magnetic 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)

Key Laboratory of Information Photonics and Optical Communications (Ministry of Education), Beijing University of Posts and Telecommunications, Beijing 100876, China

Received:2010-10-14 Revised:2011-01-18 Online:2011-06-15 Published:2011-06-15
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).

摘要/Abstract

摘要： The electron states in a two-dimensional GaAs/AlGaAs quantum ring are theoretically studied in effective mass approximation. On-centre donor impurity and uniform magnetic field perpendicular to the ring plane are taken into account. The energy spectrum with different angular momentum changes dramatically with the geometry of the ring. The donor impurity reduces the energies with an almost fixed value; however, the magnetic field alters energies in a more complex way. For example, energy levels under magnetic field will cross each other when increasing the inner radius and outer radius of the ring, leading to the fact that the arrangement of energy levels is distinct in certain geometry of the ring. Moreover, energy levels with negative angular momentum exhibit the non-monotonous dependence on the increasing magnetic field.

Abstract: The electron states in a two-dimensional GaAs/AlGaAs quantum ring are theoretically studied in effective mass approximation. On-centre donor impurity and uniform magnetic field perpendicular to the ring plane are taken into account. The energy spectrum with different angular momentum changes dramatically with the geometry of the ring. The donor impurity reduces the energies with an almost fixed value; however, the magnetic field alters energies in a more complex way. For example, energy levels under magnetic field will cross each other when increasing the inner radius and outer radius of the ring, leading to the fact that the arrangement of energy levels is distinct in certain geometry of the ring. Moreover, energy levels with negative angular momentum exhibit the non-monotonous dependence on the increasing magnetic field.

Key words: quantum ring, electron state, donor impurity, uniform magnetic field

中图分类号: (Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems)

73.21.-b

71.55.-i (Impurity and defect levels)

贾博雍, 俞重远, 刘玉敏, 韩利红, 姚文杰, 冯昊, 叶寒. Donor-bound electron states in a two-dimensional quantum ring under uniform magnetic field[J]. 中国物理B, 2011, 20(6): 67301-067301.

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). Donor-bound electron states in a two-dimensional quantum ring under uniform magnetic field[J]. Chin. Phys. B, 2011, 20(6): 67301-067301.

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Donor-bound electron states in a two-dimensional quantum ring under uniform magnetic field

Donor-bound electron states in a two-dimensional quantum ring under uniform magnetic field

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