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Area of Science:

  • Atomic, Molecular, and Optical Physics
  • Condensed Matter Physics
  • Quantum Transport

Background:

  • Anomalous transport properties in ultracold gases through ballistic constrictions have been recently measured.
  • Quantized conductance at weak interactions increases significantly with strong interactions, defying Landauer theory.

Purpose of the Study:

  • To explain the observed anomalous transport properties and excess conductance in ultracold gases.
  • To investigate the role of multichannel Andreev reflections and superconductivity in ballistic constrictions.

Main Methods:

  • Analysis of experimental data on ultracold gas transport.
  • Theoretical modeling incorporating multichannel Andreev reflections and superconductivity.

Main Results:

  • The phenomenon is explained by multichannel Andreev reflections at the constriction edges, leading to a superconducting state.
  • Andreev processes convert reflecting atomic channels into propagating condensate, causing excess conductance.
  • Superconductivity was found to suppress spin conductance, aligning with experimental observations.

Conclusions:

  • The developed model successfully explains the anomalous transport and excess conductance in ultracold gases.
  • Multichannel Andreev reflections are crucial for understanding transport in interacting quantum systems.
  • The findings support the proposed mechanism involving superconductivity and atomic interactions.