Show simple item record

dc.contributor.authorZhao, Songyuan
dc.contributor.authorWithington, S.
dc.contributor.authorGoldie, D. J.
dc.contributor.authorThomas, C. N.
dc.date.accessioned2021-01-08T17:21:29Z
dc.date.available2021-01-08T17:21:29Z
dc.date.issued2020-01-09
dc.date.submitted2019-07-18
dc.identifier.issn0022-2291
dc.identifier.others10909-019-02306-3
dc.identifier.other2306
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/315922
dc.descriptionFunder: China Scholarship Council; doi: http://dx.doi.org/10.13039/501100004543
dc.description.abstractAbstract: Superconducting thin films are central to the operation of many kinds of quantum sensors and quantum computing devices: kinetic inductance detectors (KIDs), travelling-wave parametric amplifiers (TWPAs), qubits, and spin-based quantum memory elements. In all cases, the nonlinearity resulting from the supercurrent is a critical aspect of behaviour, either because it is central to the operation of the device (TWPA), or because it results in nonideal second-order effects (KID). Here, we present an analysis of supercurrent-carrying superconducting thin films that is based on the generalized Usadel equations. Our analysis framework is suitable for both homogeneous and multi-layer thin films, and can be used to calculate the resulting density of states, superconducting transition temperature, superconducting critical current, complex conductivities, complex surface impedances, transmission line propagation constants, and nonlinear kinetic inductances in the presence of supercurrent. Our analysis gives the scale of kinetic inductance nonlinearity (I∗) for a given material combination and geometry, and is important in optimizing the design of detectors and amplifiers in terms of materials, geometries, and dimensions. To investigate the validity of our analysis across a wide range of supercurrent, we have measured the transition temperatures of superconducting thin films as a function of DC supercurrent. These measurements show good agreement with our theoretical predictions in the experimentally relevant range of current values.
dc.languageen
dc.publisherSpringer US
dc.rightsAttribution 4.0 International (CC BY 4.0)en
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectArticle
dc.subjectKinetic inductance
dc.subjectNonlinearity
dc.subjectUsadel equations
dc.subjectParametric amplifiers
dc.titleNonlinear Properties of Supercurrent-Carrying Single- and Multi-Layer Thin-Film Superconductors
dc.typeArticle
dc.date.updated2021-01-08T17:21:29Z
prism.endingPage44
prism.issueIdentifier1-2
prism.publicationNameJournal of Low Temperature Physics
prism.startingPage34
prism.volume199
dc.identifier.doi10.17863/CAM.63033
dcterms.dateAccepted2019-12-10
rioxxterms.versionofrecord10.1007/s10909-019-02306-3
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidZhao, Songyuan [0000-0002-5712-6937]
dc.identifier.eissn1573-7357


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record

Attribution 4.0 International (CC BY 4.0)
Except where otherwise noted, this item's licence is described as Attribution 4.0 International (CC BY 4.0)