## Microscopic theory of supercurrent suppression by gate-controlled surface depairing

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2023
##### Authors
Giazotto, Francesco
Cuoco, Mario
Preprint
Submitted
##### Abstract
Recently gate-mediated supercurrent suppression in superconducting nano-bridges has been reported in many experiments. This could be either a direct or an indirect gate effect. The microscopic understanding of this observation is not clear till now. Using the quasiclassical Green's function method, we show that a small concentration of magnetic impurities at the surface of the bridges can significantly help to suppress superconductivity and hence the supercurrent inside the systems while applying a gate field. This is because the gate field can enhance the depairing through the exchange interaction between the magnetic impurities at the surface and the superconductor. We also obtain a \emph{symmetric} suppression of the supercurrent with respect to the gate field, a signature of a direct gate effect. Future experiments can verify our predictions by modifying the surface with magnetic impurities.
530 Physics
##### Keywords
Mesoscale and Nanoscale Physics,superconductivity
##### Cite This
ISO 690CHAKRABORTY, Subrata, Danilo NIKOLIĆ, Juan Carlos CUEVAS, Francesco GIAZOTTO, Angelo DI BERNARDO, Elke SCHEER, Mario CUOCO, Wolfgang BELZIG, 2023. Microscopic theory of supercurrent suppression by gate-controlled surface depairing
BibTex
@unpublished{Chakraborty2023-03-14Micro-66426,
year={2023},
title={Microscopic theory of supercurrent suppression by gate-controlled surface depairing},
author={Chakraborty, Subrata and Nikolić, Danilo and Cuevas, Juan Carlos and Giazotto, Francesco and Di Bernardo, Angelo and Scheer, Elke and Cuoco, Mario and Belzig, Wolfgang}
}

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<dcterms:abstract>Recently gate-mediated supercurrent suppression in superconducting nano-bridges has been reported in many experiments. This could be either a direct or an indirect gate effect. The microscopic understanding of this observation is not clear till now. Using the quasiclassical Green's function method, we show that a small concentration of magnetic impurities at the surface of the bridges can significantly help to suppress superconductivity and hence the supercurrent inside the systems while applying a gate field. This is because the gate field can enhance the depairing through the exchange interaction between the magnetic impurities at the surface and the superconductor. We also obtain a \emph{symmetric} suppression of the supercurrent with respect to the gate field, a signature of a direct gate effect. Future experiments can verify our predictions by modifying the surface with magnetic impurities.</dcterms:abstract>
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