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

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 dramati...

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Bibliographic Details
Published in:Chinese physics B 2011-06, Vol.20 (6), p.392-396
Main Author: 贾博雍 俞重远 刘玉敏 韩利红 姚文杰 冯昊 叶寒
Format: Article
Language:English
Subjects:
AlGaAs
Aluminum gallium arsenides
Angular momentum
Electron states
Energy levels
Gallium arsenide
Impurities
Magnetic fields
Two dimensional
几何形状
均匀磁场
子环
施主杂质
有效质量
电子态
能量水平
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Summary: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.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/20/6/067301