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Crossover from Josephson to multiple Andreev reflection currents in atomic contacts.

M Chauvin¹, P vom Stein, D Esteve

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

Physical Review Letters

|October 13, 2007

Summary

Superconducting weak links transition from Cooper pair transfer to quasiparticle creation via Andreev reflections as voltage increases. A simple model explains these observed current-voltage characteristics in atomic contacts.

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Area of Science:

Condensed matter physics
Quantum electronics

Background:

Superconducting weak links exhibit complex current-voltage (I-V) characteristics.
Understanding the transition between different charge transport mechanisms is crucial.

Purpose of the Study:

To investigate the crossover in current-carrying mechanisms in superconducting weak links.
To correlate experimental observations with theoretical models.

Main Methods:

Measurement of DC current-voltage characteristics.
Utilizing superconducting atomic contacts with tunable transmission channels.

Main Results:

Observed a continuous crossover from Josephson Cooper pair transfer to multiple Andreev reflections.
Demonstrated quasiparticle creation at higher voltages.
Atomic contacts showed adjustable transmission properties.

Conclusions:

The study elucidates the voltage-dependent crossover in superconducting weak links.
A simplified resistively shunted junction model effectively describes the observed I-V curves.
Findings contribute to understanding quantum transport in mesoscopic superconducting systems.