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Open AccessArticle

Quantum Interference and Nonequilibrium Josephson Currents in Molecular Andreev Interferometers

1
Department of Physics of Complex Systems, Eötvös Loránd University, Budapest 1095, Pázmány P. s. 1/A, Hungary
2
Department of Physics, Lancaster University, Lancaster LA1 4YB, UK
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Nanomaterials 2020, 10(6), 1033; https://doi.org/10.3390/nano10061033
Received: 21 April 2020 / Revised: 20 May 2020 / Accepted: 21 May 2020 / Published: 28 May 2020
(This article belongs to the Special Issue Superconductivity in Nanoscaled Systems)
We study the quantum interference (QI) effects in three-terminal Andreev interferometers based on polyaromatic hydrocarbons (PAHs) under non-equilibrium conditions. The Andreev interferometer consists of a PAH coupled to two superconducting and one normal conducting terminals. We calculate the current measured in the normal lead as well as the current between the superconducting terminals under non-equilibrium conditions. We show that both the QI arising in the PAH cores and the bias voltage applied to a normal contact have a fundamental effect on the charge distribution associated with the Andreev Bound States (ABSs). QI can lead to a peculiar dependence of the normal current on the superconducting phase difference that was not observed in earlier studies of mesoscopic Andreev interferometers. We explain our results by an induced asymmetry in the spatial distribution of the electron- and hole-like quasiparticles. The non-equilibrium charge occupation induced in the central PAH core can result in a π transition in the current-phase relation of the supercurrent for large enough applied bias voltage on the normal lead. The asymmetry in the spatial distribution of the electron- and hole-like quasiparticles might be used to split Cooper pairs and hence to produce entangled electrons in four terminal setups. View Full-Text
Keywords: superconductivity; molecular electronics; quantum interference; Cooper pair splitting superconductivity; molecular electronics; quantum interference; Cooper pair splitting
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MDPI and ACS Style

Plaszkó, N.L.; Rakyta, P.; Cserti, J.; Kormányos, A.; Lambert, C.J. Quantum Interference and Nonequilibrium Josephson Currents in Molecular Andreev Interferometers. Nanomaterials 2020, 10, 1033. https://doi.org/10.3390/nano10061033

AMA Style

Plaszkó NL, Rakyta P, Cserti J, Kormányos A, Lambert CJ. Quantum Interference and Nonequilibrium Josephson Currents in Molecular Andreev Interferometers. Nanomaterials. 2020; 10(6):1033. https://doi.org/10.3390/nano10061033

Chicago/Turabian Style

Plaszkó, Noel L.; Rakyta, Peter; Cserti, József; Kormányos, Andor; Lambert, Colin J. 2020. "Quantum Interference and Nonequilibrium Josephson Currents in Molecular Andreev Interferometers" Nanomaterials 10, no. 6: 1033. https://doi.org/10.3390/nano10061033

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