Quantum phase transition in capacitively coupled double quantum dots.

Journal article

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.

Authors: Galpin, MR; Logan, D; Krishnamurthy, H

• Journal: Physical Review Letters
• Volume: 94
• Issue: 18
• Pages: 186406
• Publication date: 2005-05-01
• DOI: 10.1103/physrevlett.94.186406
• EISSN: 1079-7114
• ISSN: 0031-9007
• Language: English
• Keywords: cond-mat.str-el; cond-mat.mes-hall