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Related Experiment Videos

Superconducting atomic contacts under microwave irradiation.

M Chauvin1, P vom Stein, H Pothier

  • 1Quantronics Group, Service de Physique de l'Etat Condensé (CNRS URA 2464), DSM/DRECAM, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France.

Physical Review Letters
|October 10, 2006
PubMed
Summary
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Microwave irradiation reveals fractional Shapiro resonances in superconducting atomic contacts, indicating a nonsinusoidal current-phase relation. This supports quantum transport theories involving Andreev bound states.

Area of Science:

  • Superconductivity
  • Quantum Transport
  • Mesoscopic Physics

Background:

  • Superconducting atomic contacts exhibit unique quantum phenomena.
  • Shapiro resonances are well-known effects of microwave irradiation on superconductors.
  • Understanding the current-phase relation is crucial for quantum electronics.

Purpose of the Study:

  • To investigate the impact of microwave irradiation on the dc current-voltage characteristics of superconducting atomic contacts.
  • To explore the nature of current transport in highly transmitting superconducting channels.
  • To validate quantum theories of superconducting transport.

Main Methods:

  • Measurement of dc current-voltage characteristics under microwave irradiation.
  • Analysis of Shapiro resonances and supplementary fractional resonances.

Related Experiment Videos

  • Theoretical modeling based on Andreev bound states.

    • Main Results:

    • Observed replicas of supercurrent peaks (Shapiro resonances) due to microwave irradiation.
    • Detected supplementary fractional resonances in contacts with high transmission.
    • Demonstrated a nonsinusoidal current-phase relation in these contacts.
    • Observed modifications to background current via photon-assisted multiple Andreev reflections.

    Conclusions:

    • The study provides strong evidence for the full quantum theory of transport between superconductors.
    • The findings support the theoretical framework based on Andreev bound states.
    • Nonsinusoidal current-phase relations are significant in superconducting atomic contacts.