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Signatures of odd-frequency pairing in the Josephson junction current noise
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).ORCID iD: 0000-0002-6638-1796
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Connecticut, USA.ORCID iD: 0000-0003-4984-889X
Number of Authors: 32020 (English)In: Physical Review Research, E-ISSN 2643-1564, Vol. 2, no 4, article id 043193Article in journal (Refereed) Published
Abstract [en]

Odd-frequency (odd−ω) electron pair correlations naturally appear at the interface between BCS superconductors and other materials. The detection of odd−ω pairs, which are necessarily nonlocal in time, is still an open problem. The main reason is that they do not contribute to static measurements described by time-local correlation functions. Therefore, dynamical measurements, which depend on nonlocal time correlations, are suitable for detecting these pairs. In this work, we study the signatures of odd−ω pairs in the supercurrent noise through a weak link between two superconductors at different superconducting phases. We show that the finite-frequency current noise can be decomposed into three different contributions coming from even-frequency (even−ω), odd−ω pair amplitudes, and electron-hole correlation functions. Odd−ω pairing, which is interlead (between electrons at different sides of the junction), provides a positive contribution to the noise, becoming maximal at a superconducting phase difference of π. In contrast, intralead even−ω pair amplitude tends to reduce the noise, except for a region close to π controlled by the transmission of the junction.

Place, publisher, year, edition, pages
2020. Vol. 2, no 4, article id 043193
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-191639DOI: 10.1103/PhysRevResearch.2.043193ISI: 000605406700003OAI: oai:DiVA.org:su-191639DiVA, id: diva2:1540947
Available from: 2021-03-30 Created: 2021-03-30 Last updated: 2022-02-25Bibliographically approved

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Souto, Ruben SeoaneKuzmanovski, DushkoBalatsky, Alexander V.

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