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Quantum phase transition in capacitively coupled double quantum dots

Galpin, Martin R and Logan, David E and Krishnamurthy, HR (2005) Quantum phase transition in capacitively coupled double quantum dots. In: Physical Review Letters, 94 (18).

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Official URL: http://prl.aps.org/abstract/PRL/v94/i18/e186406


We investigate two equivalent, capacitively coupled semiconducting quantum dots, each coupled to its own lead, in a regime where there are two electrons on the double dot. With increasing interdot coupling, a rich range of behavior is uncovered: first a crossover from spin- to charge-Kondo physics, via an intermediate SU(4) state with entangled spin and charge degrees of freedom, followed by a quantum phase transition of Kosterlitz-Thouless type to a non-Fermi-liquid "charge-ordered" phase with finite residual entropy and anomalous transport properties. Physical arguments and numerical renormalization group methods are employed to obtain a detailed understanding of the problem.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to The American Physical Society.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Ms G Yashodha
Date Deposited: 04 Jun 2010 10:44
Last Modified: 19 Sep 2010 06:01
URI: http://eprints.iisc.ac.in/id/eprint/27522

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