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Shell effects in nonlinear magnetotransport through small quantum dots
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory.
2007 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 75, no 7, 075315- p.Article in journal (Refereed) Published
Abstract [en]

Nonlinear transport through a quantum dot attached to two metallic contacts is studied in the limit of a weak and a strong intradot Coulomb interaction. The nonequilibrium self-consistent mean-field equations for the energies and spectral weights of one-electron transitions are formulated in the strong-interaction regime. The self-consistent solutions result in a decrease of bias voltage threshold for nonzero current, contrary to the weak case. With an increase of the bias voltage window, the solutions lead to a significant deviation from the Gibbs statistics: the populations of states involved in tunneling are equalizing even at low temperatures. For a symmetric dot-contact coupling we obtain simple analytical relations between the heights of the current steps and degeneracies of a spectrum of a circular dot in a perpendicular magnetic field, in both regimes.

Place, publisher, year, edition, pages
2007. Vol. 75, no 7, 075315- p.
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Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-37133DOI: 10.1103/PhysRevB.75.075315ISI: 000244533400069Scopus ID: 2-s2.0-33846909197OAI: oai:DiVA.org:kth-37133DiVA: diva2:432194
Available from: 2011-08-01 Created: 2011-08-01 Last updated: 2017-12-08Bibliographically approved

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