Effects of screened Coulomb impurities on autoionizing two-electron resonances in spherical quantum dots

Abstract

In a recent paper (Phys. Rev. B {\bf 78}, 075316 (2008)), Sajeev and Moiseyev demonstrated that the bound-to-resonant transitions and lifetimes of autoionizing states in spherical quantum dots can be controlled by varying the confinment strength. In the present paper, we report that such control can in some cases be compromised by the presence of Coulomb impurities. It is demonstrated that a screened Coulomb impurity placed in the vicinity of the dot center can lead to bound-to-resonant transitions and to avoided crossings-like behavior when the screening of the impurity charge is varied. It is argued that these properties also can have impact on electron transport through quantum dot arrays.

References in corpus (2)

• Electron wavepacket propagation and entanglement in a chain of coupled quantum dots
• Stability of the shell structure in 2D quantum dots

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• Soft and hard confinement of a two-electron quantum system
• Two-electron resonances in quasi-one dimensional quantum dots with Gaussian confinement
• Formulae for partial widths derived from the Lindblad equation
• Study of the transition from resonance to bound states in quantum dots embedded on a nanowire using the $\mathbf{k}\cdot \mathbf{p}$ method