Zero temperature criticality of the two-dimensional gauge-glass
Department of Physics,
The two-dimensional (2D) gauge-glass model describes possible vortex glass behavior in disordered superconducting thin films and more recently has been suggested to be a bose metal at zero temperature under weak quantum fluctuations. We report recent numerical analysis of the ground state and low-lying excited states of the corresponding Coulomb gas problem which exhibits zero-temperature criticality in the classical limit. The power-law decay of the spin-wave stiffness with distance can be consistently explained in a renormalized dielectric screening theory of gapless vortex-antivortex pair excitations. These properties are in agreement with low-temperature specific heat and spin-glass susceptibility data obtained in large-scale multi-canonical
 L.-H. Tang and P.-Q. Tong, Phys. Rev. Lett. 94, 207204 (2005).