Superconductor-insulator transition in a disordered electronic system

摘要

The authors study the 2D attractive (U < 0) Hubbard model with onsite randomness using Quantum Monte Carlo simulations. The superfluid density is used to track the destruction of superconductivity in the ground state with increasing disorder. The non-superconducting state is identified as an insulator from the temperature dependence of its d.c. resistivity. The value of (sigma)(sub dc) at the superconductor-insulator transition appears to be non-universal.