Electronic transmittance phase extracted from mesoscopic interferometers

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buir.contributor.authorTanatar, Bilal
buir.contributor.orcidTanatar, Bilal|0000-0002-5246-0119
dc.citation.volumeNumber7en_US
dc.contributor.authorTolea, M.en_US
dc.contributor.authorMoldoveanu V.en_US
dc.contributor.authorDinu I.V.en_US
dc.contributor.authorTanatar, Bilalen_US
dc.date.accessioned2016-02-08T09:42:35Z
dc.date.available2016-02-08T09:42:35Z
dc.date.issued2012en_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractThe usual experimental set-up for measuring the wave function phase shift of electrons tunneling through a quantum dot (QD) embedded in a ring (i.e., the transmittance phase) is the so-called 'open' interferometer as first proposed by Schuster et al. in 1997, in which the electrons back-scattered at source and the drain contacts are absorbed by additional leads in order to exclude multiple interference. While in this case one can conveniently use a simple two-path interference formula to extract the QD transmittance phase, the open interferometer has also a number of draw-backs, such as a reduced signal and some uncertainty regarding the effects of the extra leads. Here we present a meaningful theoretical study of the QD transmittance phase in 'closed' interferometers (i.e., connected only to source and drain leads). By putting together data from existing literature and giving some new proofs, we show both analytically and by numerical simulations that the existence of phase lapses between consecutive resonances of the 'bare' QD is related to the signs of the corresponding Fano parameters - of the QD + ring system. More precisely, if the Fano parameters have the same sign, the transmittance phase of the QD exhibits a π lapse. Therefore, closed mesoscopic interferometers can be used to address the 'universal phase lapse' problem. Moreover, the data from already existing Fano interference experiments from Kobayashi et al. in 2003 can be used to infer the phase lapses. © 2012 Tolea et al.en_US
dc.identifier.doi10.1186/1556-276X-7-568Cen_US
dc.identifier.issn19317573
dc.identifier.urihttp://hdl.handle.net/11693/21182
dc.language.isoEnglishen_US
dc.relation.isversionofhttp://dx.doi.org/10.1186/1556-276X-7-568Cen_US
dc.source.titleNanoscale Research Lettersen_US
dc.subjectAharonov-Bohm interferometersen_US
dc.subjectPhase lapse problemen_US
dc.subjectPhase measurementen_US
dc.subjectAharonov-Bohm interferometersen_US
dc.subjectBack-scattereden_US
dc.subjectDrain contactsen_US
dc.subjectFano interferenceen_US
dc.subjectFano parametersen_US
dc.subjectMesoscopic interferometersen_US
dc.subjectMultiple interferencesen_US
dc.subjectPhase lapse problemen_US
dc.subjectRing systemsen_US
dc.subjectSource and drainsen_US
dc.subjectTheoretical studyen_US
dc.subjectTransmittance phaseen_US
dc.subjectInterference suppressionen_US
dc.subjectPhase measurementen_US
dc.subjectSuperconducting materialsen_US
dc.subjectInterferometersen_US
dc.titleElectronic transmittance phase extracted from mesoscopic interferometersen_US
dc.typeArticleen_US

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