Dynamics of capacitively coupled double quantum dots


Autoria(s): Galpin, Martin R; Logan, David E; Krishnamurthy, HR
Data(s)

26/07/2006

Resumo

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.

Formato

application/pdf

Identificador

http://eprints.iisc.ernet.in/28892/1/dots.pdf

Galpin, Martin R and Logan, David E and Krishnamurthy, HR (2006) Dynamics of capacitively coupled double quantum dots. In: Journal of Physics: Condensed Matter, 18 (29). pp. 6571-6583.

Publicador

Institute of Physics

Relação

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

http://eprints.iisc.ernet.in/28892/

Palavras-Chave #Physics
Tipo

Journal Article

PeerReviewed