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

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

2006-07-24

arxiv.org/abs/cond-mat/0607618v4

Phys. Rev. B 74, 174508 (2006)

Physics

Condensed Matter

Other Condensed Matter

8 pages, 7 figures

Scientific paper

10.1103/PhysRevB.74.174508

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 non interacting 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.

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