Superfluid-Insulator and Roughening Transitions in Domain Walls

ORAL

Abstract

We have investigated superfluid behavior of one and two dimensional interfaces separating solid domains. The system is described by the hard-core Bose-Hubbard Hamiltonian with nearest-neighbor interaction. We present the analysis of superfluid-insulator transition of the interface based on our quntantum Monte Carlo simulations. We also show that, in one dimension the transition is accompanied by the roughening transition, driven by proliferation of charge-1/2 quasiparticles.

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Authors

  • Sebnem Gunes Soyler

    Physics Department, University of Massachusetts, Amherst, University of Massachusetts at Amherst

  • Barbara Capogrosso-Sansone

    Physics Department, University of Massachusetts, Amherst, University of Massachusetts at Amherst

  • Nikolay Prokof'ev

    University of Massachusetts, Amherst, UMASS Amherst, UMASS, Amherst; ETH Zurich; Kurchatov Institute, Moscow, Physics Department, University of Massachusetts, Amherst, University of Massachusetts at Amherst, University of Massachusetts, Amherst, MA 01003, USA

  • Boris Svistunov

    University of Massachusetts, Amherst, UMASS Amherst, Department of Physics, University of Massachusetts Amherst, UMASS, Amherst; Kurchatov Institute, Moscow, Physics Department, University of Massachusetts, Amherst, University of Massachusetts at Amherst