RT Journal Article
T1 Donor-bound electrons in quantum rings under magnetic fields
A1 Amado, M.
A1 Lima, R. P. A.
A1 González-Santander de la Cruz, Clara
A1 Domínguez-Adame Acosta, Francisco
AB 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.
PB American Physical Society
SN 1098-0121
YR 2007
FD 2007-08
LK https://hdl.handle.net/20.500.14352/51245
UL https://hdl.handle.net/20.500.14352/51245
LA eng
NO © 2007 The American Physical Society.The authors thank T. V. Bandos, D. Granados, and J. M. García for helpful discussions. This work was supported by MEC  Project MOSAICO. R.P.A.L. acknowledges financial support from MEC through the Juan de la Cierva program.
NO MEC
DS Docta Complutense
RD 10 jul 2025