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

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

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.

Keywords: quantum ring electron state donor impurity uniform magnetic field

Received: 14 October 2010
Revised: 18 January 2011
Accepted manuscript online:

PACS:	73.21.-b	(Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems)
	71.55.-i	(Impurity and defect levels)

Fund: 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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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 2011 Chin. Phys. B 20 067301

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

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