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Transport through quasi-degenerate states in coupled quantum dots
KTH, Superseded Departments, Physics.
2004 (English)In: Photonics and Nanostructures - Fundamentals and Applications, ISSN 1569-4410, Vol. 2, no 1, 11-21 p.Article in journal (Refereed) Published
Abstract [en]

By means of a general method for treating mesoscopic systems with strong internal correlations, transport properties through a set of quasi-degenerate transitions in the interacting region, or active element (AE), are considered. It is shown that the behaviour of the AE drastically changes as the couplings to the contacts are varied from the strong to the weak coupling limit. These changes strongly influence the transport properties of the system, from a single increase of the current to a staircase form with unequally large steps. In the present study, kinematic interactions, non-equilibrium populations numbers and dependence on the bias voltage has been included in the treatment of the local properties of the AE. Analytical results for the equilibrium situation are presented as well as a derivation of the corresponding non-equilibrium quantities. Results from self-consistent numerical calculations of the considered case are presented.

Place, publisher, year, edition, pages
2004. Vol. 2, no 1, 11-21 p.
Keyword [en]
Green functions, Non-equilibrium, Quantum dots, Quasi-degenerate states, Transport, Correlation methods, Green's function, Kinematics, Quantum theory, Resonant tunneling, Transport properties, Active element (AE), Semiconductor quantum dots
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-157441DOI: 10.1016/j.photonics.2004.02.001ScopusID: 2-s2.0-3042695207OAI: diva2:771089

QC 20141212

Available from: 2014-12-12 Created: 2014-12-09 Last updated: 2014-12-12Bibliographically approved

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Fransson, Jonas
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