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

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

2010-05-03

arxiv.org/abs/1005.0284v1

Physical Review B, vol. 81, p. 125315 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.81.125315

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.

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