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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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The Josephson heat interferometer.

Francesco Giazotto1, María José Martínez-Pérez

  • 1NEST, Istituto Nanoscienze-CNR and Scuola Normale Superiore, Piazza San Silvestro 12, I-56127 Pisa, Italy. giazotto@sns.it

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|December 22, 2012
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Summary
This summary is machine-generated.

Researchers demonstrate a novel Josephson heat interferometer. This device shows phase-dependent heat transport, confirming predictions of thermal interference in Josephson junctions and enabling coherent heat manipulation in nanocircuits.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Phenomena
  • Nanotechnology

Background:

  • The Josephson effect demonstrates macroscopic quantum phase coherence and is the basis for superconducting quantum interference devices (SQUIDs).
  • Theoretical predictions exist for phase-dependent thermal transport in Josephson junctions, analogous to electric interferometers, but experimental realization remains elusive.

Purpose of the Study:

  • To experimentally investigate phase-dependent heat transport in a Josephson junction system.
  • To realize and characterize a thermal analogue of the electric Josephson interferometer.

Main Methods:

  • Utilized two temperature-biased normal metal electrodes tunnel-coupled via a direct-current SQUID.
  • Measured heat exchange and temperature oscillations as a function of magnetic flux.

Main Results:

  • Observed phase-dependent heat transport, confirming theoretical predictions.
  • Demonstrated magnetic-flux-dependent temperature oscillations up to 21 mK.
  • Achieved a flux-to-temperature transfer coefficient exceeding 60 mK/Φ₀ at 235 mK.

Conclusions:

  • Confirmed the existence of a unique, phase-dependent thermal current in Josephson junctions.
  • The Josephson heat interferometer enables coherent manipulation of heat in solid-state nanocircuits.
  • Opens new avenues for quantum heat transport studies and applications.