The Josephson heat interferometer (Articolo in rivista)

Type
Label
  • The Josephson heat interferometer (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1038/nature11702 (literal)
Alternative label
  • Giazotto, F; Martinez-Perez, MJ (2012)
    The Josephson heat interferometer
    in Nature (Lond.)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Giazotto, F; Martinez-Perez, MJ (literal)
Pagina inizio
  • 401 (literal)
Pagina fine
  • 405 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 492 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR, Ist Nanosci, NEST, I-56127 Pisa, Italy Scuola Normale Super Pisa, I-56127 Pisa, Italy (literal)
Titolo
  • The Josephson heat interferometer (literal)
Abstract
  • The Josephson effect(1) is perhaps the prototypical manifestation of macroscopic phase coherence, and forms the basis of a widely used electronic interferometer-the superconducting quantum interference device(2) (SQUID). In 1965, Maki and Griffin predicted(3) that the thermal current through a temperature-biased Josephson tunnel junction coupling two superconductors should be a stationary periodic function of the quantum phase difference between the superconductors: a temperature-biased SQUID should therefore allow heat currents to interfere(4,5), resulting in a thermal version of the electric Josephson interferometer. This phase-dependent mechanism of thermal transport has been the subject of much discussion(4,6-8) but, surprisingly, has yet to be realized experimentally. Here we investigate heat exchange between two normal metal electrodes kept at different temperatures and tunnel-coupled to each other through a thermal 'modulator' (ref. 5) in the form of a direct-current SQUID. We find that heat transport in the system is phase dependent, in agreement with the original prediction. Our Josephson heat interferometer yields magnetic-flux-dependent temperature oscillations of up to 21 millikelvin in amplitude, and provides a flux-to-temperature transfer coefficient exceeding 60 millikelvin per flux quantum at 235 millikelvin. In addition to confirming the existence of a phase-dependent thermal current unique to Josephson junctions, our results point the way towards the phase-coherent manipulation of heat in solid-state nanocircuits. (literal)
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