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      Electronic transmittance phase extracted from mesoscopic interferometers

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      Author(s)
      Tolea, M.
      Moldoveanu V.
      Dinu I.V.
      Tanatar, Bilal
      Date
      2012
      Source Title
      Nanoscale Research Letters
      Print ISSN
      19317573
      Volume
      7
      Language
      English
      Type
      Article
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      Abstract
      The 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.
      Keywords
      Aharonov-Bohm interferometers
      Phase lapse problem
      Phase measurement
      Aharonov-Bohm interferometers
      Back-scattered
      Drain contacts
      Fano interference
      Fano parameters
      Mesoscopic interferometers
      Multiple interferences
      Phase lapse problem
      Ring systems
      Source and drains
      Theoretical study
      Transmittance phase
      Interference suppression
      Phase measurement
      Superconducting materials
      Interferometers
      Permalink
      http://hdl.handle.net/11693/21182
      Published Version (Please cite this version)
      http://dx.doi.org/10.1186/1556-276X-7-568C
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      • Department of Physics 2397
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