Single-particle versus pair condensation of hard-core bosons with correlated hopping

K. P. Schmidt, J. Dorier, A. Läuchli, and F. Mila
Phys. Rev. B 74, 174508 – Published 15 November 2006

Abstract

We investigate the consequences of correlated hopping on the ground state properties of hard-core bosons on a square lattice as revealed by extensive exact diagonalizations and quantum Monte Carlo simulations. While for noninteracting hard-core bosons the effective attraction induced by the correlated hopping leads to phase separation at low density, we show that a modest nearest-neighbor repulsion suppresses phase separation, leading to a remarkable low-density pairing phase with no single particle Bose-Einstein condensation but long-range two-particle correlations, signaling a condensation of pairs. We also explain why the unusual properties of the pairing phase are a real challenge for standard one-worm quantum Monte Carlo simulations.

    • Received 26 July 2006

    DOI:https://doi.org/10.1103/PhysRevB.74.174508

    ©2006 American Physical Society

    Authors & Affiliations

    K. P. Schmidt1,*, J. Dorier1, A. Läuchli2, and F. Mila1

    • 1Institute of Theoretical Physics, École Polytechnique Fédérale de Lausanne, CH 1015 Lausanne, Switzerland
    • 2Institut Romand de Recherche Numérique en Physique des Matériaux (IRRMA), CH-1015 Lausanne, Switzerland

    • *Electronic address: kaiphillip.schmidt@epfl.ch

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    Issue

    Vol. 74, Iss. 17 — 1 November 2006

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