Quantum phase transition in capacitively coupled double quantum dots

Galpin, Martin R. ; Logan, David E. ; Krishnamurthy, H. R. (2005) Quantum phase transition in capacitively coupled double quantum dots Physical Review Letters, 94 (18). 186406_1-186406_4. ISSN 0031-9007

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

Related URL: http://dx.doi.org/10.1103/PhysRevLett.94.186406


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:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:17530
Deposited On:16 Nov 2010 09:38
Last Modified:17 May 2016 02:09

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