Wensauer, Andreas and Kainz, Josef and Suhrke, Michael and Rössler, Ulrich (2001) Circular parabolic quantum dots with repulsive off-center impurities: an SDFT study. Physica Status Solidi (B) 224 (3), pp. 675-679.
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Quantum dots (QDs) realized by etching or gate structures in a two-dimensional electron system may, under realistic conditions, contain an impurity atom which causes deviations of the electron structure from the ideal case. We have performed ground-state calculations for circular disk-like QDs with a parabolic confinement potential and a repulsive off-center impurity. Besides the distance of the impurity from the dot center we can vary its strength using a Coulomb potential for its shape. The essential effect of the off-center impurity is the breaking of the axial symmetry with the consequence of removing degeneracies in the single-particle spectrum which is related to shell and spin phenomena. We quantify these effects in the ground-state energy and the spin densities by applying spin-density functional theory (SDFT) in the local spin density approximation (LSDA).
|Institutions:||Physics > Institute of Theroretical Physics > Retired Professors > Group Ulrich Rössler|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||20 Mar 2007|
|Last Modified:||20 Jul 2011 20:55|