From finite-size scaling of Monte Carlo data, the universal conductivity [sigma][sup *] and the critical exponents at the transition are determined and the result is roughly consistent with experiments reported so far.Expand

The parameters of the Landau-Ginzburg functional are obtained from first-principles estimates and from finite-size exact diagonalization studies and used to estimate the dependence of the critical temperature for the Kosterlitz-Thouless phase transition on layer separation.Expand

A unitary transformation is described which eliminates terms coupling states with differing numbers of doubly occupied sites from the Hamiltonian of the Hubbard model and results in an expansion in powers of the hopping integral t divided by the on-site energy U.Expand

We argue that whenever the transition between the insulating and superconducting phases of a disordered two-dimensional Fermi system at zero temperature ({ital T}=0) is continuous, the system behaves… Expand

Theorie du spectre d'excitation collective dans le regime d'effet Hall quantique fractionnel est encore difficile thangoliairement d'universitaire.Expand

The zero-temperature universal conductivity of two-dimensional (2D) films at the supeconductor-insulator transition is studied and an analysis in 1D suggests that in the presence of disorder, the universal Conductivity in films might be somewhat smaller than this value.Expand

This work investigates the effect of quantum fluctuations on the Coulomb blockade in a single tunnel junction coupled to its environment by a transmission line of arbitrary impedance with weak power-law zero-bias anomaly.Expand