Quasiparticle dynamics in superconducting tunnel junctions

A.G. Kozorezov, G. Brammertz, G. Brammertz, R.A. Hijmering, J.K. Wigmore, A. Peacock, B. Martin, D. Martin, P. Verhoeve, Alexandre Avraamovitch Golubov, Horst Rogalla

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Superconducting Tunnel Junctions (STJs) used as single photon detectors possess extreme sensitivity and excellent resolving power. However, like many other cryogenic detectors they operate under extremely non-equilibrium conditions. In order to understand the physics of the non-equilibrium, non-stationary state, to interpret experimental data adequately, and to optimize the STJs unique performance, it is necessary to use a fully kinetic approach. We have developed the detailed theory of interactions between quasiparticles (qps) and the two types of phonons, sub-gap and pair-breaking, in STJ photon detectors. We discuss the results of extensive sets of experiments to study the non-equilibrium state in Al-based STJs. For the first time we are capable of explaining all available data systematically using a single set of parameters determined from STJ diagnostics and independent experiments.
Original languageUndefined
Pages (from-to)695-
JournalNuclear instruments & methods in physics research. Section A : Accelerators, spectrometers, detectors and associated equipment
Volume559
Issue number2
DOIs
Publication statusPublished - 2006

Keywords

  • IR-74517
  • METIS-233776

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