@Article{Granato:2017:RaGaMo,
               author = "Granato, Enzo",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Random gauge models of the superconductor-insulator transition in 
                         two-dimensional disordered superconductors",
              journal = "Physical Review B",
                 year = "2017",
               volume = "96",
               number = "18",
                pages = "184510",
             keywords = "Josephson-Junction Arrays, Quantum Phase Transitions, Type Ii 
                         Superconductors, Vortex Glass.",
             abstract = "We study numerically the superconductor-insulator transition in 
                         two-dimensional inhomogeneous superconductors with gauge disorder, 
                         described by four different quantum rotor models: a gauge glass, a 
                         flux glass, a binary phase glass, and a Gaussian phase glass. The 
                         first two models describe the combined effect of geometrical 
                         disorder in the array of local superconducting islands and a 
                         uniform external magnetic field, while the last two describe the 
                         effects of random negative Josephson-junction couplings or 
                         \π junctions. Monte Carlo simulations in the path-integral 
                         representation of the models are used to determine the critical 
                         exponents and the universal conductivity at the quantum phase 
                         transition. The gauge- and flux-glass models display the same 
                         critical behavior, within the estimated numerical uncertainties. 
                         Similar agreement is found for the binary and Gaussian phase-glass 
                         models. Despite the different symmetries and disorder 
                         correlations, we find that the universal conductivity of these 
                         models is approximately the same. In particular, the ratio of this 
                         value to that of the pure model agrees with recent experiments on 
                         nanohole thin-film superconductors in a magnetic field, in the 
                         large disorder limit.",
                  doi = "10.1103/PhysRevB.96.184510",
                  url = "http://dx.doi.org/10.1103/PhysRevB.96.184510",
                 issn = "1098-0121",
                label = "lattes: 2370990773271434 1 Granato:2017:RaGaMo",
             language = "en",
           targetfile = "granato_random.pdf",
        urlaccessdate = "27 abr. 2024"
}