Binding energy of an off-center shallow donor D- in a spherical quantum dot

Details Binding energy of an off-center shallow donor D- in a spherical quantum dot Binding energy of an off-center shallow donor D- in a spherical quantum dot

2009-04-29

arxiv.org/abs/0904.4700v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 2 figures

Scientific paper

The binding energy of a negatively charged hydrogenic impurity with on- and off-center position 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.

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