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

• Published in: Chinese physics B Vol. 20; no. 6; pp. 392 - 396
• Main Author: 贾博雍 俞重远 刘玉敏 韩利红 姚文杰 冯昊 叶寒
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.06.2011
• 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
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/20/6/067301

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.