Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 42, Issue 5, Pages 1563-1566Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physe.2009.12.045
Keywords
Donor binding energy; Quantum dot; Off-center impurity
Funding
- CONICET (Argentina)
- Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCyT, Argentina)
- Universidad Nacional del Nordeste [PICTO-204/07, PI-112/07]
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The binding energy of a negatively charged hydrogenic impurity with on- and off-center positions in a spherical Gaussian quantum dot was calculated with the configuration interaction method. Our calculations show that E-b is always positive for on-center impurities with a maximum near to the radius for one-electron stability of the potential well R-c. For off-center positions the binding energy can assume negative values within a range of the quantum dot radius, thus indicating the instability of the system. (C) 2010 Elsevier B.V. All rights reserved.
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