Fano effect in a double T-shaped interferometer
Date
2009Source Title
European Physical Journal B
Print ISSN
1434-6028
Publisher
Springer
Volume
67
Issue
2
Pages
231 - 238
Language
English
Type
ArticleItem 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 transportsDecoherence 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