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 and the critical exponents at the transition. The result =(0.55±0.66)(2e/h for bosons with long-range Coulomb interaction is roughly consistent with experiments reported so far. We also find =(0.14±0.03)(2e/h for bosons with short-range interactions.
- Received 18 January 1994
DOI:https://doi.org/10.1103/PhysRevB.49.12115
©1994 American Physical Society