Phase Modulated Thermal Conductance of Josephson Weak Links

Erhai Zhao, Tomas Löfwander, J. A. Sauls

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

We present a theory for quasiparticle heat transport through superconducting weak links. The thermal conductance depends on the phase difference ([Formula presented]) of the superconducting leads. Branch-conversion processes, low-energy Andreev bound states near the contact, and the suppression of the local density of states near the gap edge are related to phase-sensitive transport processes. Theoretical results for the influence of junction transparency, temperature, and disorder, on the conductance, are reported. For high-transmission weak links, [Formula presented], the formation of an Andreev bound state leads to suppression of the density of states for the continuum excitations, and thus, to a reduction in the conductance for [Formula presented]. For low-transmission ([Formula presented]) barriers resonant scattering leads to an increase in the thermal conductance as [Formula presented] drops below [Formula presented] (for phase differences near [Formula presented]).

Original languageEnglish (US)
JournalPhysical review letters
Volume91
Issue number7
DOIs
StatePublished - Aug 14 2003

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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