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

Abstract

The binding energy of a negatively charged hydrogenic impurity with on-and offcenter position in a spherical Gaussian quantum dot was calculated with the configuraction 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 Key words: donor binding energy, quantum dot, off-center impurity PACS: 71.55.-i, 73.21.La

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