Signatures of odd-frequency pairing in the Josephson junction current noise
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 de...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2020-11-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.043193 |
| _version_ | 1797211211829346304 |
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| author | Rubén Seoane Souto Dushko Kuzmanovski Alexander V. Balatsky |
| author_facet | Rubén Seoane Souto Dushko Kuzmanovski Alexander V. Balatsky |
| author_sort | Rubén Seoane Souto |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-24T10:22:53Z |
| format | Article |
| id | doaj.art-73559a0afeee4e6db8f73a18178bd5bf |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:22:53Z |
| publishDate | 2020-11-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-73559a0afeee4e6db8f73a18178bd5bf2024-04-12T17:03:32ZengAmerican Physical SocietyPhysical Review Research2643-15642020-11-012404319310.1103/PhysRevResearch.2.043193Signatures of odd-frequency pairing in the Josephson junction current noiseRubén Seoane SoutoDushko KuzmanovskiAlexander V. BalatskyOdd-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.http://doi.org/10.1103/PhysRevResearch.2.043193 |
| spellingShingle | Rubén Seoane Souto Dushko Kuzmanovski Alexander V. Balatsky Signatures of odd-frequency pairing in the Josephson junction current noise Physical Review Research |
| title | Signatures of odd-frequency pairing in the Josephson junction current noise |
| title_full | Signatures of odd-frequency pairing in the Josephson junction current noise |
| title_fullStr | Signatures of odd-frequency pairing in the Josephson junction current noise |
| title_full_unstemmed | Signatures of odd-frequency pairing in the Josephson junction current noise |
| title_short | Signatures of odd-frequency pairing in the Josephson junction current noise |
| title_sort | signatures of odd frequency pairing in the josephson junction current noise |
| url | http://doi.org/10.1103/PhysRevResearch.2.043193 |
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