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Heat transport in proximity structures.

E V Bezuglyi1, V Vinokur

  • 1Institute for Low Temperature Physics and Engineering, Kharkov, 61103 Ukraine.

Physical Review Letters
|October 4, 2003
PubMed
Summary
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Heat and charge transport in diffusive superconducting wires are suppressed due to Andreev reflections. Thermal conductance rapidly decreases with temperature, explaining experimental results.

Area of Science:

  • Condensed matter physics
  • Quantum transport phenomena

Background:

  • Understanding heat and charge transport is crucial for novel electronic devices.
  • Superconducting proximity effects in diffusive systems are complex and require further investigation.

Purpose of the Study:

  • To investigate heat and charge transport through a normal diffusive wire coupled to a superconducting wire.
  • To analyze the impact of Andreev reflection on thermal and electrical conductance.
  • To explore the behavior of thermal conductance in an Andreev interferometer geometry.

Main Methods:

  • Theoretical study of quasiparticle transport at the interface of normal and superconducting diffusive wires.
  • Analysis of partial Andreev reflection effects on subgap thermal flow.
  • Examination of electrical and thermal conductance as a function of temperature and phase difference.

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Main Results:

  • Subgap thermal flow is suppressed due to partial Andreev reflection, decreasing with energy.
  • Electrical conductance exhibits a reentrance effect.
  • Thermal conductance rapidly decreases with temperature, aligning with experimental observations.
  • In Andreev interferometers, thermal conductance shows full-scale oscillations with the order parameter phase difference.

Conclusions:

  • Partial Andreev reflection significantly suppresses thermal transport in diffusive superconducting structures.
  • The temperature dependence of thermal conductance provides a qualitative explanation for recent experimental findings.
  • Oscillatory behavior of thermal conductance in interferometers offers insights into phase-dependent quantum phenomena.