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      Fano effect in a double T-shaped interferometer

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      Author
      Moldoveanu, V.
      Dinu, I. V.
      Tanatar, Bilal
      Date
      2009
      Source Title
      European Physical Journal B
      Print ISSN
      1434-6028
      Publisher
      Springer
      Volume
      67
      Issue
      2
      Pages
      231 - 238
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      We study the coherent transport in a one-dimensional lead with two side-coupled quantum dots using the Keldysh's Green function formalism.The effect of the interdot Coulomb interaction is taken into account by computing the firstand second order contributions to the self-energy.We show that the Fano interference due to the resonance of one dotis strongly affected by the fixed parameters that characterize the second dot. If the second dot is tuned close to resonance an additionalpeak develops between the peak and dip of the Fano line shape of the current. In contrast, when the second dotis off-resonance and its occupation number is close to unity the interdot Coulomb interaction merely shifts the Fano line and no other maxima appear.The system we consider is more general than the single-dot interferometer studied experimentally by Kobayashi et al. [Phys. Rev. B 70, 035319 (2004)] and may be used for controlling quantum interference and studying decoherence effects in mesoscopic transport.
      Keywords
      Coherent transports
      Decoherence effects
      Fano effects
      Fano interference
      Fixed parameters
      Green function
      Line shape
      Mesoscopic transport
      Off-resonance
      Quantum interference
      Second orders
      Side-coupled quantum dot
      Coulomb interactions
      Interferometers
      Interferometry
      Resonance
      Semiconductor quantum dots
      Quantum chemistry
      Permalink
      http://hdl.handle.net/11693/22875
      Published Version (Please cite this version)
      http://dx.doi.org/10.1140/epjb/e2009-00012-0
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