Persistent current noise in narrow Josephson junctions
Kuzmanovski, Dushko ; Souto, Rubén Seoane LU
and Balatsky, Alexander V.
(2021)
In Physical Review B
104(10).
- Abstract
Josephson junctions have broad applications in metrology, quantum information processing, and remote sensing. For these applications, the electronic noise is a limiting factor. In this work we study the thermal noise in narrow Josephson junctions using a tight-binding Hamiltonian. For a junction longer than the superconducting coherence length, several self-consistent gap profiles appear close to a phase difference π. They correspond to two stable solutions with an approximately constant phase gradient over the thin superconductor connected by a 2π phase slip, and a solitonic branch. The current noise power spectrum has pronounced peaks at the transition frequencies between the different states in each branch. We find that the noise is... (More)
Josephson junctions have broad applications in metrology, quantum information processing, and remote sensing. For these applications, the electronic noise is a limiting factor. In this work we study the thermal noise in narrow Josephson junctions using a tight-binding Hamiltonian. For a junction longer than the superconducting coherence length, several self-consistent gap profiles appear close to a phase difference π. They correspond to two stable solutions with an approximately constant phase gradient over the thin superconductor connected by a 2π phase slip, and a solitonic branch. The current noise power spectrum has pronounced peaks at the transition frequencies between the different states in each branch. We find that the noise is reduced in the gradient branches in comparison to the zero-length junction limit. In contrast, the solitonic branch exhibits an enhanced noise and a reduced current due to the pinning of the lowest excitation energy to close to zero energy.
(Less)
- author
- Kuzmanovski, Dushko
; Souto, Rubén Seoane
LU
and Balatsky, Alexander V.
- organization
- publishing date
- 2021-09-01
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B
- volume
- 104
- issue
- 10
- article number
- L100505
- publisher
- American Physical Society
- external identifiers
-
- scopus:85115810564
- ISSN
- 2469-9950
- DOI
- 10.1103/PhysRevB.104.L100505
- language
- English
- LU publication?
- yes
- id
- 32a7e279-b176-478d-8820-754acbe40f64
- date added to LUP
- 2021-10-06 22:37:04
- date last changed
- 2023-10-11 02:07:55
@article{32a7e279-b176-478d-8820-754acbe40f64,
abstract = {{<p>Josephson junctions have broad applications in metrology, quantum information processing, and remote sensing. For these applications, the electronic noise is a limiting factor. In this work we study the thermal noise in narrow Josephson junctions using a tight-binding Hamiltonian. For a junction longer than the superconducting coherence length, several self-consistent gap profiles appear close to a phase difference π. They correspond to two stable solutions with an approximately constant phase gradient over the thin superconductor connected by a 2π phase slip, and a solitonic branch. The current noise power spectrum has pronounced peaks at the transition frequencies between the different states in each branch. We find that the noise is reduced in the gradient branches in comparison to the zero-length junction limit. In contrast, the solitonic branch exhibits an enhanced noise and a reduced current due to the pinning of the lowest excitation energy to close to zero energy.</p>}},
author = {{Kuzmanovski, Dushko and Souto, Rubén Seoane and Balatsky, Alexander V.}},
issn = {{2469-9950}},
language = {{eng}},
month = {{09}},
number = {{10}},
publisher = {{American Physical Society}},
series = {{Physical Review B}},
title = {{Persistent current noise in narrow Josephson junctions}},
url = {{http://dx.doi.org/10.1103/PhysRevB.104.L100505}},
doi = {{10.1103/PhysRevB.104.L100505}},
volume = {{104}},
year = {{2021}},
}