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|Title:||Functional renormalization group study of parallel double quantum dots: Effects of asymmetric dot-lead couplings|
|Authors:||Protsenko, V. S.|
Katanin, A. A.
|Publisher:||American Physical Society|
|Citation:||Protsenko V. S. Functional renormalization group study of parallel double quantum dots: Effects of asymmetric dot-lead couplings / V. S. Protsenko, A. A. Katanin. — DOI 10.1103/PhysRevB.95.245129 // Physical Review B. — 2017. — Vol. 95. — Iss. 24. — 245129.|
|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. © 2017 American Physical Society.|
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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