Quasiparticle diffusion and energy resolution in superconducting tunneling junctions

Details Quasiparticle diffusion and energy resolution in superconducting tunneling junctions Quasiparticle diffusion and energy resolution in superconducting tunneling junctions

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..605...35d&link_type=abstract

LOW TEMPERATURE DETECTORS: Ninth International Workshop on Low Temperature Detectors. AIP Conference Proceedings, Volume 605, p

Physics

1

Superconducting Device Characterization, Design, And Modeling

Scientific paper

One of the factors that limits the energy resolution of superconducting tunnel junctions (STJs) as photon detectors is the spatial dependence of the response on the photoabsorption site. To assess the role of spatial inhomogeneities, we have analyzed quasiparticle (qp) diffusion processes in detail and developed a general analytical theory to describe the evolution of the qp density in an STJ. This theory accounts for (mild) non-linearity due to qp self-recombination, and includes the effects due to multiple qp tunneling, phonon coupling between the electrodes, diffusive losses into electrical connections and localized traps and losses at the edges. The theory does not require any assumptions about symmetry between base and counter electrode. We have derived an analytical model of the STJ response surface and the corresponding spectral lineshape, which allows the influence of the above features to be treated independently. We discuss two examples of the application of this model in practice and demonstrate how this model can be used to obtain a thorough understanding of the factors that limit the energy resolution in STJs as photon detectors. .

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