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Circular Parabolic Quantum Dots with Repulsive Off‐Center Impurities: An SDFT Study
Author(s) -
Wensauer A.,
Kainz J.,
Suhrke M.,
Rössler U.
Publication year - 2001
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(200104)224:3<675::aid-pssb675>3.0.co;2-1
Subject(s) - quantum dot , impurity , condensed matter physics , spin (aerodynamics) , electron , center (category theory) , ground state , physics , density functional theory , coulomb , atom (system on chip) , atomic physics , chemistry , quantum mechanics , computer science , embedded system , thermodynamics , crystallography
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).