Quantum interference and non equilibrium Josephson currents in molecular Andreev interferometers

Plaszkó, Noel and Rakyta, Peter and Cserti, Jozsef and Kormanyos, Andor and Lambert, Colin (2020) Quantum interference and non equilibrium Josephson currents in molecular Andreev interferometers. Nanomaterials, 10 (6). ISSN 2079-4991

[img]
Text (Quantum interference and non equilibrium Josephson currents in molecular Andreev interferometers)
noneq_andreev_molec.pdf - Accepted Version
Available under License Creative Commons Attribution.

Download (3MB)

Abstract

We study the quantum interference (QI) effects in three-terminal Andreev interferometers based on polyaromatic hydrocarbons (PAH’s) 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 (ABS’s). 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 p 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.

Item Type:
Journal Article
Journal or Publication Title:
Nanomaterials
ID Code:
144168
Deposited By:
Deposited On:
21 May 2020 15:20
Refereed?:
Yes
Published?:
Published
Last Modified:
22 Sep 2020 05:01