The superconductor-insulator transition in 2D dirty boson systems

Abstract

Universal properties of the zero temperature superconductor-insulator transition in two-dimensional amorphous films are studied by extensive Monte Carlo simulations of bosons in a disordered medium. We report results for both short-range and long-range Coulomb interactions for several different points in parameter space. In all cases we observe a transition from a superconducting phase to an insulating Bose glass phase. {}From finite-size scaling of our Monte Carlo data we determine the universal conductivity ${\sigma }^{\ast }$ and the critical exponents at the transition. The result ${\sigma }^{\ast }=(0.55\pm 0.06)(2e{)}^2/h$ for bosons with long-range Coulomb interaction is roughly consistent with experiments reported so far. We also find ${\sigma }^{\ast }=(0.14\pm 0.03)(2e{)}^2/h$ for bosons with short-range interactions.

Revtex 3.0, 54 pages, 17 figures included, UBCTP-93-017

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• I-V Characteristics of High Temperature Superconductors with Columnar Defects
• Universal Conductivity in the Two dimensional Boson Hubbard Model
• Soluble `Supersymmetric' Quantum XY Model

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