Fano-effect and negative differential conductance in asymmetric parallel coupled quantum dots

Transport through coupled quantum dot system has been studied, using non-equilibrium Green function formalism. Inter-dot tunneling with on-dot Coulomb repulsion is included while inter-dot Coulomb interaction is neglected. Behavior of system in transition from series configuration to symmetric paral...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2010, Vol.405 (1), p.239-246
Main Authors: Chand, Shyam, Moudgil, R.K., Ahluwalia, P.K.
Format: Article
Language:English
Subjects:
Asymmetry
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Conductance
Coulomb blockade
Coulomb friction
Coupled quantum dots
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport in multilayers, nanoscale materials and structures
Exact sciences and technology
Fano effect
Fermi surfaces
Formalism
Negative differential conductance
Physics
Quantum dots
Tunneling
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Summary:Transport through coupled quantum dot system has been studied, using non-equilibrium Green function formalism. Inter-dot tunneling with on-dot Coulomb repulsion is included while inter-dot Coulomb interaction is neglected. Behavior of system in transition from series configuration to symmetric parallel and in T-shaped coupled quantum dot system has been explored. Transmission coefficient as a function of Fermi energy shows Fano effect during transition. The system shows negative differential conductance and reverse current at low bias in series. It has been shown that the existence of negative differential conductance during transition from series to asymmetric parallel configuration is regulated by a competition between inter-dot tunneling and dot-lead coupling. Effect of inter-dot tunneling on negative differential conductance and on transport properties of T-shaped double dot has been studied.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2009.08.066