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

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

2007-08-03

arxiv.org/abs/0708.0539v2

Physica E 40 1002-1005 (2008).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures; Submitted to Physica E (EP2DS-17 proceedings, oral presentation), updated Refs

Scientific paper

10.1016/j.physe.2007.08.098

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.

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