Superfluid-insulator transition in a commensurate one-dimensional bosonic system with off-diagonal disorder.
We study the nature of the superfluid-insulator quantum phase transition in a one-dimensional system of lattice bosons with off-diagonal disorder in the limit of a large integer filling factor. Monte Carlo simulations of two strongly disordered models show that the universality class of the transition in question is the same as that of the superfluid-Mott-insulator transition in a pure system. This result can be explained by disorder self-averaging in the superfluid phase and the applicability of the standard quantum hydrodynamic action. We also formulate the necessary conditions which should be satisfied by the stong-randomness universality class, if one exists.
Balabanyan
Karén G
KG
Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA.
Prokof'ev
Nikolay
N
Svistunov
Boris
B