Bose-glass to superfluid transition in the three-dimensional Bose-Hubbard model

We present a Monte Carlo study of the Bose glass to superfluid transition in the three-dimensional Bose-Hubbard model. Simulations are performed on the classical (3+1) dimensional link-current representation using the geometrical worm algorithm. Finite-size scaling analysis (on lattices as large as 16×16×16×512 sites) of the superfluid stiffness and the compressibility is consistent with a value of the dynamical critical exponent z=3, in …