Functional renormalization group study of parallel double quantum dots: Effects of asymmetric dot-lead couplings

V. S. Protsenko, A. A. Katanin

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2 Citations (Scopus)

Abstract

We explore the effects of asymmetry of hopping parameters between double parallel quantum dots and the leads on the conductance and a possibility of local magnetic moment formation in this system using functional renormalization group approach with the counterterm. We demonstrate a possibility of a quantum phase transition to a local moment regime [so-called singular Fermi liquid (SFL) state] for various types of hopping asymmetries and discuss respective gate voltage dependencies of the conductance. We show that, depending on the type of the asymmetry, the system can demonstrate either a first-order quantum phase transition to an SFL state, accompanied by a discontinuous change of the conductance, similarly to the symmetric case, or the second-order quantum phase transition, in which the conductance is continuous and exhibits Fano-type asymmetric resonance near the transition point. A semianalytical explanation of these different types of conductance behavior is presented.

Original languageEnglish
Article number245129
JournalPhysical Review B
Volume95
Issue number24
DOIs
Publication statusPublished - 22 Jun 2017
Externally publishedYes

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