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dc.contributor.authorDavidovich, Maria Augustapt_BR
dc.contributor.authorAnda, Enrique V.pt_BR
dc.contributor.authorIglesias, Jose Robertopt_BR
dc.contributor.authorChiappe, Giuseppept_BR
dc.date.accessioned2014-10-07T02:11:23Zpt_BR
dc.date.issued1997pt_BR
dc.identifier.issn0163-1829pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/104220pt_BR
dc.description.abstractWe present an analysis of the Kondo effect on the Bohm-Aharonov oscillations of the tunneling currents in a mesoscopic ring with a quantum dot inserted in one of its arms. The system is described by an Andersonimpurity tight-binding Hamiltonian where the electron-electron interaction is restricted to the dot. The currents are obtained using nonequilibrium Green functions calculated through a cumulant diagrammatic expansion in the chain approximation. It is shown that at low temperature, even with the system out of resonance, the Kondo peak provides a channel for the electron to tunnel through the dot, giving rise to the Bohm-Aharonov oscillations of the current. At high temperature these oscillations are important only if the dot level is aligned to the Fermi level, when the resonance condition is satisfied.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofPhysical review. B, Condensed matter. New York. Vol. 55, no. 12 (Mar. 1997), p. r7335-r7338pt_BR
dc.rightsOpen Accessen
dc.subjectSistemas mesoscopicospt_BR
dc.subjectEfeito kondopt_BR
dc.subjectEfeito Aharonov-Bohmpt_BR
dc.subjectModelo de Andersonpt_BR
dc.subjectNivel de fermipt_BR
dc.titleBohm-Aharonov and Kondo effects on tunneling currents in a mesoscopic ringpt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000188542pt_BR
dc.type.originEstrangeiropt_BR


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