Universal conductivity of dirty bosons at the superconductor-insulator transition
Erik S. Sørensen, Mats Wallin, S. M. Girvin, A. Peter Young
DOI 10.1103/PhysRevLett.69.828 · Physical Review Letters
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Abstract
The superconductor-insulator transition at zero temperature in two dimensions is studied by Monte Carlo simulations of interacting bosons (Cooper pairs) moving in a quenched random potential. We calculate the universal conductivity σ* and the critical exponents at the superconductor-insulator transition. For the short-range repulsive case we find σ*=(0.14±0.03)σQ, where σQ−1==RQ ==h/(2e)2≃6.45kΩ, and for long-range Coulomb interactions we find σ*=(0.55±0.1)σQ.
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