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Disordered superconductors show reproducible voltage fluctuations, demonstrating the quantum nature of vortices. This phenomenon is consistent with Aharonov-Casher physics, offering new insights into superconductivity.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Superconductivity

Background:

  • The Aharonov-Casher effect is analogous to the Aharonov-Bohm effect for neutral particles with magnetic moments.
  • Vortices encompassing electric charges are predicted to cause persistent, fluctuating voltages.

Purpose of the Study:

  • To investigate reproducible voltage fluctuations in disordered superconductors.
  • To interpret these fluctuations within the framework of Aharonov-Casher physics.

Main Methods:

  • Experimental observation of voltage fluctuations in disordered superconductors.
  • Analysis using random matrix theory.
  • Parameter variation including magnetic field and gate voltage.

Main Results:

  • Reproducible, magnetic-field-antisymmetrical voltage fluctuations were observed.
  • Fluctuation correlation functions and curvature distributions align with Aharonov-Casher physics predictions.
  • Quantum nature of vortices demonstrated in disordered superconductors above and below Tc.

Conclusions:

  • Disordered superconductors exhibit phenomena consistent with Aharonov-Casher physics.
  • The observed voltage fluctuations are the vortex equivalent of universal conductance fluctuations.
  • This study confirms the quantum behavior of vortices in superconductors.