Zero-temperature criticality in the two-dimensional gauge glass model

摘要

The zero-temperature critical state of the two-dimensional gauge glass modelis investigated. It is found that low-energy vortex configurations afford asimple description in terms of gapless, weakly interacting vortex-antivortexpair excitations. A linear dielectric screening calculation is presented in arenormalization group setting that yields a power-law decay of spin-wavestiffness with distance. These properties are in agreement with low-temperaturespecific heat and spin-glass susceptibility data obtained in large-scalemulti-canonical Monte Carlo simulations.