Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 16: Transport: Quantum Dots, Quantum Wires, Point Contacts
TT 16.2: Vortrag
Montag, 7. März 2016, 15:15–15:30, H21
Signatures of nonlocal Cooper pair transport in the critical current of a double dot Josephson junction — •Benedikt Probst1, Fernando Domínguez2, Alexander Schroer1, Alfredo Levy Yeyati2, and Patrik Recher1,3 — 1Institut für Mathematische Physik, Technische Universität Braunschweig, D-38106 Braunschweig, Germany — 2Departamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC), and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, E-28049 Madrid, Spain — 3Laboratory for Emerging Nanometrology Braunschweig, D-38106 Braunschweig, Germany
We study the critical Josephson current flowing through a double quantum dot weakly coupled to two superconducting leads. We use analytical as well as numerical methods to investigate this setup in the entire range of its microscopic parameters, where we account for on-site interactions exactly. The characteristic behavior we find does not rely on a tunable magnetic field through the structure. Instead, we identify groundstate transitions as the unifying mechanism which gives rise to the rich phenomenology we observe, and which provide clear indications of nonlocal spin-entangled pairs that are consistent with recent experiments [1].
S. Deacon et al., Nat. Commun. 6, 7446 (2015)