Dynamics of capacitively coupled double quantum dots

Galpin, Martin R. ; Logan, David E. ; Krishnamurthy, H. R. (2006) Dynamics of capacitively coupled double quantum dots Journal of Physics: Condensed Matter, 18 (29). pp. 6571-6583. ISSN 0953-8984

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Official URL: http://iopscience.iop.org/0953-8984/18/29/002

Related URL: http://dx.doi.org/10.1088/0953-8984/18/29/002

Abstract

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.

Item Type:Article
Source:Copyright of this article belongs to Institute of Physics Publishing.
ID Code:17592
Deposited On:16 Nov 2010 09:41
Last Modified:17 May 2016 02:12

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