Effects of screened Coulomb impurities on autoionizing two-electron resonances in spherical quantum dots
2010 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 81, no 12, 125315- p.Article in journal (Refereed) Published
In a recent paper [Phys. Rev. B 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 confinement 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-crossinglike-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.
Place, publisher, year, edition, pages
2010. Vol. 81, no 12, 125315- p.
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:su:diva-38124DOI: 10.1103/PhysRevB.81.125315ISI: 000276248900099OAI: oai:DiVA.org:su-38124DiVA: diva2:306121