Effects of on-Center Impurity on Persistent Current in a Two-Dimensional Quantum Ring
In this paper, a theoretical study of on-center donor and acceptor impurities effects on the energy spectra and persistent current in a two-dimensional quantum ring in the presence of magnetic flux are presented. For a single electron, it is shown that the donor impurity increases significantly the gradient of energy levels relative to magnetic flux while the acceptor impurity decreases it. Then, a giant increment of persistent current can take place due to the presence of donor impurity. It is shown that the magnitude of persistent current in a quantum ring increases when the average ring radius decreases. But, increment of persistent current in the presence of donor impurity is considerable for a quantum ring with larger average radius. For two interacting electrons confined in a quantum ring with donor impurity, the magnitude of persistent current is mainly increased at definite intervals of magnetic flux while it is decreased elsewhere.
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Document Type: Research Article
Publication date: 01 January 2013
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