Charge Dynamics Across the Disorder Driven Superconductor-Insulator Transition

Abstract

While insensitive to weak non magnetic disorder, an s-wave superconductor can be driven insulating by strong disorder. Using a scheme that captures the correct ground state, and fully retains thermal amplitude and phase fluctuations, we describe the disorder driven superconductor-insulator transition at finite temperature. Our results on the resistivity suggest that beyond moderate disorder the low temperature superconducting state can arise out of an insulating normal state. We also find that the low frequency weight in the density of states and optical conductivity are non monotonic in disorder, with a maximum near critical disorder, and their high temperature value correlate with the superconducting fraction in the disordered ground state.

6 pages, 4 figures. Minor changes in figures; inserted discussion about Coulomb interactions and fluctuation effects in conductivity. Matches published version

References in corpus (9)

• Localization of preformed Cooper-pairs in disordered superconductors
• Nature of the superconductor-insulator transition in disordered superconductors
• Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition
• Superconducting properties and Hall Effect of epitaxial NbN thin films
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• Phase fluctuations in a strongly disordered s-wave superconductor close to the metal-insulator transition
• Quantum Metallicity on the High-Field Side of the Superconductor-Insulator Transition
• Tunneling studies in a homogeneously disordered s-wave superconductor: NbN
• Frequency dependent superfluid stiffness in the pseudogap regime in strongly disordered NbN thin films

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• A real space auxiliary field approach to the BCS-BEC crossover
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