Fano effect in a double T-shaped interferometer |
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Authors: | V Moldoveanu I V Dinu B Tanatar |
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Institution: | (1) National Institute of Materials Physics, P.O. Box MG-7, 077125 Bucharest-Magurele, Romania;(2) Department of Physics, Bilkent University, Bilkent, 06800 Ankara, Turkey |
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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. |
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Keywords: | PACS" target="_blank">PACS 73 23 Hk Coulomb blockade single-electron tunneling 85 35 Ds Quantum interference devices 85 35 Be Quantum well devices 73 21 La Quantum dots |
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