Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/102102
Title: Functional renormalization group study of parallel double quantum dots: Effects of asymmetric dot-lead couplings
Authors: Protsenko, V. S.
Katanin, A. A.
Issue Date: 2017
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.
URI: http://hdl.handle.net/10995/102102
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85024126253
PURE ID: 1976738
559f7433-bcd4-49b0-93c5-bf6bb05c45e7
ISSN: 24699950
DOI: 10.1103/PhysRevB.95.245129
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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