Transmission in double quantum dots in the Kondo regime: Quantum-critical transitions and interference effects

We study the transmission through a double quantum-dot system in the Kondo regime. An exact expression for the transmission coefficient in terms of fully interacting many-body Green's functions is obtained. By mapping the system into an effective Anderson impurity model, one can determine the t...

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Bibliographic Details
Published in:	Physica. E, Low-dimensional systems & nanostructures Low-dimensional systems & nanostructures, 2008-03, Vol.40 (5), p.1002-1005
Main Authors:	Dias da Silva, Luis G.G.V., Sandler, Nancy, Ingersent, Kevin, Ulloa, Sergio E.
Format:	Article
Language:	eng
Subjects:	Exact sciences and technology Kondo effect Physics Quantum dots
Online Access:	Get full text
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Summary:	We study the transmission through a double quantum-dot system in the Kondo regime. An exact expression for the transmission coefficient in terms of fully interacting many-body Green's functions is obtained. By mapping the system into an effective Anderson impurity model, one can determine the transmission using numerical renormalization group methods. The transmission exhibits signatures of the different Kondo regimes of the effective model, including an unusual Kondo phase with split peaks in the spectral function, as well as a pseudogapped regime exhibiting a quantum critical transition between Kondo and unscreened phases.
ISSN:	1386-9477 1873-1759