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dc.contributor.authorMoldoveanu, V.en_US
dc.contributor.authorTanatar, Bilalen_US
dc.date.accessioned2016-02-08T10:09:18Z
dc.date.available2016-02-08T10:09:18Z
dc.date.issued2008en_US
dc.identifier.issn1098-0121
dc.identifier.urihttp://hdl.handle.net/11693/23127
dc.description.abstractThe effect of electron-electron interactions on coherent transport in quantum dot systems is theoretically investigated by adapting the well-known random-phase approximation (RPA) to the nonequilibrium Green-Keldysh formalism for open mesoscopic systems. The contour-ordered polarization operator is computed in terms of the Green functions of the noninteracting system. We apply the proposed RPA-Keldysh scheme for studying Coulomb-modified Fano lines and dephasing effects in interferometers with side-coupled many-level dots. Our method allows us to treat on equal footing the decoherence induced by the intradot interaction and that by the Coulomb coupling to a nearby system. In the case of a single interferometer, we show that the intradot Coulomb interaction leads to a reduction of the Fano line amplitude. From the analysis of the interaction self-energy, it follows that this effect originates in inelastic scattering processes in which electron-hole pairs are involved. The interplay between the interdot and the intradot interactions in decoherence is discussed for two nearby identical T-shaped interferometers. We also show that the intradot interaction does not prevent the observation of controlled dephasing due to a nearby charge detector, as long as the latter is subjected to a sufficiently large bias.en_US
dc.language.isoEnglishen_US
dc.source.titlePhysical Review B - Condensed Matter and Materials Physicsen_US
dc.relation.isversionofhttp://dx.doi.org/10.1103/PhysRevB.77.195302en_US
dc.titleCoulomb effects in open quantum dots within the random-phase approximationen_US
dc.typeArticleen_US
dc.departmentDepartment of Physicsen_US
dc.citation.spage195302-1en_US
dc.citation.epage195302-11en_US
dc.citation.volumeNumber77en_US
dc.citation.issueNumber19en_US
dc.identifier.doi10.1103/PhysRevB.77.195302en_US
dc.publisherThe American Physical Societyen_US
dc.contributor.bilkentauthorTanatar, Bilal


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