Andreev transport through side-coupled double quantum dots

2008/05/28 by Yoichi Tanaka, Yoïchi Tanaka, Norio Kawakami +1
Physics and Astronomy · #Charge (physics) #Condensed matter physics #Conductance #Coulomb #Electrical resistivity and conductivity #Kondo effect #Physics #Physics of Superconductivity and Magnetism #Plateau (mathematics) #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Singlet state #Superconductivity #Topological Materials and Phenomena #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.78.035444

published as Phys. Rev. B 78, 035444 (2008) · 6 pages, 5 figures

arxiv created 2008/05/28 · openalex publication_date 2008/07/29 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We study the transport through side-coupled double quantum dots, connected to normal and superconducting (SC) leads with a T-shape configuration. We find, using the numerical renormalization group, that the Coulomb interaction suppresses SC interference in the side dot, and enhances the conductance substantially in the Kondo regime. This behavior stands in total contrast to a wide Kondo valley seen in the normal transport. The SC proximity penetrating into the interfacial dot pushes the Kondo clouds, which screens the local moment in the side dot, toward the normal lead to make the singlet bond long. The conductance shows a peak of unitary limit as the cloud expands. Furthermore, two separate Fano structures appear in the gate-voltage dependence of the Andreev transport, where a single reduced plateau appears in the normal transport.

Citations

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