Disorder induced superconducting ratchet effect in nanowires

Details Disorder induced superconducting ratchet effect in nanowires Disorder induced superconducting ratchet effect in nanowires

2010-12-27

arxiv.org/abs/1012.5609v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

A dc voltage drop develops along amorphous indium oxide nanowires that are exposed to an ac bias source. This voltage is anti-symmetric with magnetic field and is characterized by sample specific quasi-periodic magneto-voltage oscillations. The voltage magnitude increases with decreasing temperature below $T_{C}$ but saturates at low T. As the disorder of the sample is decreased, the dc voltage is suppressed. We suggest that this rectification is a manifestation of the superconducting ratchet effect in which disorder and geometrical confinement play the role of asymmetric pinning centers. This effect demonstrates the importance of inherent inhomogeneity and vortex motion in the superconductor-insulator transition of disordered superconductors.

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