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The role of photons in establishing a non-equilibrium quasiparticle state in small gap mulitple tunnelling superconducting tunnel junctions.

Research output: Contribution to journalJournal article

Published

Journal publication date11/2004
Journalphysica status solidi (c)
Journal number11
Volume1
Number of pages4
Pages2816-2819
Original languageEnglish

Abstract

We derive expressions for phonon escape times from a thin superconducting film. The escape time is determined by the rate of scattering conversion for phonons propagating beyond the critical cone for total internal reflection. The conversion is due to different scattering processes for the groups of Cooper pair breaking and sub-gap phonons. For pair breaking phonons the most efficient conversion mechanism is through the interaction with the condensate. For sub-gap phonons the conversion rate is much slower and for plane parallel films is due to elastic scattering at surface or interface roughness resulting in significantly slower escape times. We discuss implications of slow escape time for sub-gap phonons for the properties of the recently observed new non-equilibrium state in small gap multiple tunnelling superconducting tunnel junctions.