Superfluid--Insulator Transition in Commensurate One-Dimensional Bosonic System with Off-Diagonal Disorder

ORAL

Abstract

We analyze the superfluid--insulator transition in a system of one-dimensional (1D) lattice bosons with off-diagonal disorder in the limit of large commensurate filling. We argue---in contrast to the recent prediction (E.~Altman, Y.~Kafri, A.~Polkovnikov, and G.~Refael, cond-mat/0402177) of strong- randomness fixed point for this system---that at any strength of disorder the universality class of the transition on the superfluid side coincides with that of the superfluid--Mott- insulator transition in a pure system. We present results of Monte Carlo simulations for two strongly disordered models that are in excellent agreement with the advocated scenario.

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Authors

  • Kar\'en Balabanyan

    • Department of Physics, University of Massachusetts, MA 01003

  • Nikolay Prokof'ev

    • Dept. of Physics, UMASS, Amherst; "Kurchatov Institute", Moscow
    • University of Massachusetts
    • Department of Physics, University of Massachusetts, MA 01003; Russian Research Center ``Kurchatov Institute", 123182 Moscow, Russia

  • Boris Svistunov

    • UMASS, Amherst, and Kurchatov Institute, Moscow
    • University of Massachusetts, Amherst
    • Univ. of Massachusetts, Amherst
    • University of Massachusetts
    • Department of Physics, University of Massachusetts, MA 01003; Russian Research Center ``Kurchatov Institute", 123182 Moscow, Russia