Composite fermions and the field-tuned superconductor-insulator transition

Abstract

In several two-dimensional films that exhibit a magnetic field-tuned superconductor to insulator transition (SIT), stable metallic phases have been observed. Building on the `dirty boson' description of the SIT, we suggest that the metallic region is analogous to the composite Fermi liquid observed about half-filled Landau levels of the two-dimensional electron gas. The composite fermions here are mobile vortices attached to one flux quantum of an emergent gauge field. The composite vortex liquid is a 2D non-Fermi liquid metal, which we argue is stable to weak quenched disorder. We describe several experimental consequences of the emergent composite vortex liquid.

7 pages, 2 figures

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• Heavy Operators and Hydrodynamic Tails
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• Vortex Variable Range Hopping in a Conventional Superconducting Film
• Scaling and Diffusion of Dirac Composite Fermions
• Vanishing Hall Conductance in the Phase Glass Bose Metal at Zero Temperature
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• Voltage-tuned anomalous-metal to metal transition in hybrid Josephson junction arrays
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