Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 9: Quantum Dots, Quantum Wires, Point Contacts
TT 9.4: Talk
Monday, March 12, 2018, 10:30–10:45, HFT-FT 101
Electron transport and thermoelectricity in quantum dot Cooper-pair splitters — •Robert Hussein1, Sigmund Kohler2, Wolfgang Belzig1, Francesco Giazotto3, Michele Governale4, and Alessandro Braggio3 — 1Fachbereich Physik, Universität Konstanz, Germany — 2Instituto de Ciencia de Materiales de Madrid, CSIC, Spain — 3NEST, Istituto Nanoscienze-CNR, Italy — 4Victoria University of Wellington, New Zealand
We investigate electronic and thermoelectric transport in a Cooper-pair splitter based on a double quantum dot realized in a nanowire. We study how the interplay between local and nonlocal tunneling processes between the superconductor and the dots influences the transport properties. For finite Coulomb interaction and in the presence of interdot tunneling, the Cooper-pair splitter may develop spatial entanglement even in the absence of the cross Andreev reflection process. We show that the spin-orbit coupling of the nanowire can be used to control the symmetry (singlet or triplet) of the entangled electron pairs. We further analize under which conditions thermoelectric induced currents may lead to nonlocal cooling of one of the normal contacts, and when they may give rise to nonlocal power generation.
[1] R. Hussein, L. Jaurigue, M. Governale, and A. Braggio, Phys. Rev. B 94, 235134 (2016).
[2] R. Hussein, A. Braggio, and M. Governale, Phys. Status Solidi B 254, 1600603 (2017).