Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 14: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs 1
TT 14.9: Talk
Monday, March 20, 2017, 17:30–17:45, HSZ 201
Double quantum dot Cooper-pair splitter at finite couplings — •Robert Hussein1,2, Lina Jaurigue3, Michele Governale3, and Alessandro Braggio2,4 — 1Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany — 2SPIN-CNR, Via Dodecaneso 33, 16146 Genova, Italy — 3School of Chemical and Physical Sciences and MacDiarmid Institute for Advanced Materials and Nanotechnology,Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand — 4NEST, Istituto Nanoscienze-CNR, Piazza S. Silvestro 12, Pisa I-56127, Italy
We investigate the sub-gap physics of a Cooper-pair splitter based on a double quantum dot realized in a semiconducting nanowire. We study how the transport properties are determined by the interplay between local and nonlocal tunneling processes between the superconductor and the quantum dots. In the presence of interdot tunneling the system provides a simple mechanism to generate nonlocal entanglement even in the absence of nonlocal coupling with the superconducting lead. We show that spin-orbit interaction in combination with finite Coulomb energy opens the possibility to control the symmetry (singlet or triplet) of nonlocally entangled electron pairs.
[1] R. Hussein, L. Jaurigue, M. Governale, and A. Braggio, arXiv:1608.00504, accepted in Phys. Rev. B.