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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

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Published on: June 3, 2015

Electronic refrigeration at the quantum limit.

Andrey V Timofeev1, Meri Helle, Matthias Meschke

  • 1Low Temperature Laboratory, Helsinki University of Technology, 02015 TKK, Finland.

Physical Review Letters
|June 13, 2009
PubMed
Summary
This summary is machine-generated.

We achieved quantum-limited electronic refrigeration in microcircuits. Impedance matching enabled cooling at a distance via superconducting leads, demonstrating electromagnetic heat transport.

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Area of Science:

  • Quantum physics
  • Low-temperature physics
  • Condensed matter physics

Background:

  • Electronic refrigeration is crucial for sensitive measurements.
  • Understanding heat transport in superconductors is key for quantum technologies.
  • Remote cooling in microcircuits presents significant challenges.

Purpose of the Study:

  • To demonstrate quantum-limited electronic refrigeration of a metallic island.
  • To investigate impedance matching for remote cooling in microcircuits.
  • To analyze the interplay between electromagnetic and quasiparticle heat transport in superconductors.

Main Methods:

  • Fabrication of a low-temperature microcircuit with a metallic island.
  • Utilizing superconducting leads for heat transfer.
  • Comparing performance with matched and mismatched circuit impedances.
  • Measuring cooling power and analyzing heat flux.

Main Results:

  • Quantum-limited electronic refrigeration was successfully demonstrated.
  • Impedance matching enabled refrigeration at a distance of approximately 50 micrometers.
  • Cooling power was found to be determined by the quantum of thermal conductance.
  • A clear crossover between electromagnetic and quasiparticle heat flux was observed and analyzed.

Conclusions:

  • Impedance matching is critical for achieving remote electronic refrigeration.
  • The results support the concept of electromagnetic heat transport in microcircuits.
  • This work provides insights into heat transfer mechanisms in superconductors.