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research article

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

Schmidt, K. P.
•
Dorier, J.
•
Läuchli, A.
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2006
Physical Review B

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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Type
research article
DOI
10.1103/PhysRevB.74.174508
Author(s)
Schmidt, K. P.
Dorier, J.
Läuchli, A.
Mila, F.  
Date Issued

2006

Published in
Physical Review B
Volume

74

Issue

17

Article Number

174508

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CTMC  
Available on Infoscience
June 24, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/158480
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