Dynamics of capacitively coupled double quantum dots

Details Dynamics of capacitively coupled double quantum dots Dynamics of capacitively coupled double quantum dots

2006-08-08

arxiv.org/abs/cond-mat/0608186v1

J. Phys.: Condens. Matter 18, 6571 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 6 figures

Scientific paper

10.1088/0953-8984/18/29/002

We consider a double dot system of equivalent, capacitively coupled semiconducting quantum dots, each coupled to its own lead, in a regime where there are two electrons on the double dot. Employing the numerical renormalization group, we focus here on single-particle dynamics and the zero-bias conductance, considering in particular the rich range of behaviour arising as the interdot coupling is progressively increased through the strong coupling (SC) phase, from the spin-Kondo regime, across the SU(4) point to the charge-Kondo regime; and then towards and through the quantum phase transition to a charge-ordered (CO) phase. We first consider the two-self-energy description required to describe the broken symmetry CO phase, and implications thereof for the non-Fermi liquid nature of this phase. Numerical results for single-particle dynamics on all frequency scales are then considered, with particular emphasis on universality and scaling of low-energy dynamics throughout the SC phase. The role of symmetry breaking perturbations is also briefly discussed.

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