Controlled dephasing in single-dot Aharonov-Bohm interferometers

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buir.contributor.authorTanatar, Bilal
buir.contributor.orcidTanatar, Bilal|0000-0002-5246-0119
dc.citation.epage045309-9en_US
dc.citation.issueNumber4en_US
dc.citation.spage045309-1en_US
dc.citation.volumeNumber75en_US
dc.contributor.authorMoldoveanu, V.en_US
dc.contributor.authorŢolea, M.en_US
dc.contributor.authorTanatar, Bilalen_US
dc.date.accessioned2016-02-08T10:15:40Z
dc.date.available2016-02-08T10:15:40Z
dc.date.issued2007en_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractWe study the Fano effect and the visibility of the Aharonov-Bohm oscillations for a mesoscopic interferometer with an embedded quantum dot in the presence of a nearby second dot. When the electron-electron interaction between the two dots is considered the nearby dot acts as a charge detector. We compute the currents through the interferometer and detector within the Keldysh formalism and the self-energy of the nonequilibrium Green's functions is found up to the second order in the interaction strength. The current formula contains a correction to the Landauer-Büttiker formula. Its contribution to transport and dephasing is discussed. As the bias applied on the detector is increased, the amplitude of both the Fano resonance and Aharonov-Bohm oscillations are considerably reduced due to controlled dephasing. This result is explained by analyzing the behavior of the imaginary part of the interaction self-energy as a function of energy and bias. We emphasize as well the role of the ring-dot coupling. Our theoretical results are consistent with the experimental observation of Buks [Nature 391, 871 (1998)].en_US
dc.identifier.doi10.1103/PhysRevB.75.045309en_US
dc.identifier.issn1098-0121
dc.identifier.urihttp://hdl.handle.net/11693/23557
dc.language.isoEnglishen_US
dc.relation.isversionofhttp://dx.doi.org/10.1103/PhysRevB.75.045309en_US
dc.source.titlePhysical Review B - Condensed Matter and Materials Physicsen_US
dc.titleControlled dephasing in single-dot Aharonov-Bohm interferometersen_US
dc.typeArticleen_US
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