Universal Voltage Fluctuations in Disordered Superconductors
arXiv:2006.00566 · doi:10.1103/PhysRevLett.125.147002
Abstract
The Aharonov-Casher effect is the analogue of the Aharonov-Bohm effect that applies to neutral particles carrying a magnetic moment. This can be manifested by vortices or fluxons flowing in trajectories that encompass an electric charge. These have been predicted to result in a persistent voltage which fluctuates for different sample realizations. Here we show that disordered superconductors exhibit reproducible voltage fluctuation, antisymmetrical with respect to magnetic field, as a function of various parameters such as magnetic field amplitude, field orientations and gate voltage. These results are interpreted as the vortex equivalent of the universal conductance fluctuations typical of mesoscopic disordered metallic systems. We analyze the data in the framework of random matrix theory and show that the fluctuation correlation functions and curvature distributions exhibit behavior which is the fingerprint of Aronov-Casher physics. The results demonstrate the quantum nature of the vortices in highly disordered superconductors both above and below .
arXiv comment8 pages 9 figures
References in corpus (21)
- Random-Matrix Theory of Quantum Transport
- Localization of preformed Cooper-pairs in disordered superconductors
- Nature of the superconductor-insulator transition in disordered superconductors
- Inhomogeneous Pairing in Highly Disordered s-wave Superconductors
- Single and two-particle energy gaps across the disorder-driven superconductor-insulator transition
- Transport Through Quantum Melts
- Superconductor-Insulator Transition in a Disordered Electronic System
- Nanowire Acting as a Superconducting Quantum Interference Device
- Random-Matrix Theory of Parametric Correlations in the Spectra of Disordered Metals and Chaotic Billiards
- Scale dependent superconductor-insulator transition
- Parametric Conductance Correlation for Irregularly Shaped Quantum Dots
- Experimental demonstration of Aharonov-Casher interference in a Josephson junction circuit
- Universal Parametric Correlations of Conductance Peaks in Quantum Dots
- "Level Curvature" Distribution for Diffusive Aharonov-Bohm Systems: analytical results
- An inhomogeneous Josephson phase in thin-film and High-Tc superconductors
- Distribution of level curvatures for the Anderson model at the localization-delocalization transition
- Disorder induced superconducting ratchet effect in nanowires
- Quantum criticality at the superconductor insulator transition probed by the Nernst effect
- Bose Metal as a Disruption of the Berezinskii-Kosterlitz-Thouless Transition in 2D Superconductors
- Non-universal corrections to the level curvature distribution beyond random matrix theory
- Level Curvature Distribution and the Structure of Eigenfunctions in Disordered Systems