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Interplay between Josephson and Aharonov-Bohm effects in Andreev interferometers.

Pavel E Dolgirev1, Mikhail S Kalenkov2,3, Andrei D Zaikin4,5

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Quantum coherence in hybrid nanostructures reveals a trade-off between Josephson current and quantum dephasing. This study explores non-equilibrium effects and their impact on superconducting nanocircuits.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Nanotechnology

Background:

  • Hybrid normal-superconducting nanostructures exhibit proximity-induced quantum effects.
  • Interplay between Josephson and Aharonov-Bohm effects is crucial in these systems.

Purpose of the Study:

  • To elucidate the trade-off between non-equilibrium Josephson current stimulation and quasiparticle dephasing.
  • To investigate quantum coherent oscillations in voltage-driven hybrid nanostructures.

Main Methods:

  • Theoretical analysis of multi-terminal nanostructures.
  • Modeling of quantum coherence, Josephson currents, and Aharonov-Bohm effects.

Main Results:

  • A trade-off exists between enhanced Josephson current and reduced quantum coherence due to dephasing.
  • Quantum dephasing diminishes both Josephson and Aharonov-Bohm currents.
  • Predicted phase-shifted quantum coherent oscillations in electrostatic potential with magnetic flux.

Conclusions:

  • Understanding the interplay of non-equilibrium effects and dephasing is key for controlling quantum phenomena in nanocircuits.
  • Results offer pathways for engineering superconducting nanocircuits with tailored quantum properties.