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

Schmidt KP (2006)


Publication Status: Published

Publication Type: Journal article

Publication year: 2006

Journal

Publisher: AMERICAN PHYSICAL SOC

Book Volume: 74

Journal Issue: 17

DOI: 10.1103/PhysRevB.74.174508

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.

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How to cite

APA:

Schmidt, K.P. (2006). Single-particle versus pair condensation of hard-core bosons with correlated hopping. Physical Review B, 74(17). https://doi.org/10.1103/PhysRevB.74.174508

MLA:

Schmidt, Kai Phillip. "Single-particle versus pair condensation of hard-core bosons with correlated hopping." Physical Review B 74.17 (2006).

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