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Article overview
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Nonlinear Properties of Supercurrent-Carrying Single and Multi-Layer Thin-Film Superconductors | | Songyuan Zhao
; Stafford Withington
; David J. Goldie
; Chris N. Thomas
; | | Date: |
18 Jul 2019 | | Abstract: | 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 non-ideal
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 multilayer 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. | | Source: | arXiv, 1907.8071 | | Services: | Forum | Review | PDF | Favorites | |
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