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oai:docta.ucm.es:20.500.14352/512452023-08-27T20:24:05Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Amado, M. author Lima, R. P. A. author González-Santander de la Cruz, Clara author Domínguez-Adame Acosta, Francisco author 2007-08 We theoretically study donor-bound electron states in two-dimensional quantum rings of finite width. A strong magnetic field is applied perpendicular to the plane of the quantum ring. The resulting electronic states are obtained within the effective-mass approximation. For on-center donors, the radial Hamiltonian for the envelope function is exactly diagonalized, and the corresponding energy levels for different angular momenta are studied as a function of the applied magnetic field. Confinement properties change rapidly with the external magnetic field. An abrupt change of the localization properties appears at a critical magnetic field, since the electron is mainly localized around the impurity. This transition gives rise to well-defined anticrossing of levels as a function of the magnetic field. Intraband transitions are found to carry relevant information of these confining properties of the rings. 1098-0121 10.1103/PhysRevB.76.073312 https://hdl.handle.net/20.500.14352/51245 http://dx.doi.org/10.1103/PhysRevB.76.073312 http://journals.aps.org Donor-bound electrons in quantum rings under magnetic fields