Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.215301
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Funding
- Institut Francilien de Recherche sur les Atomes Froids (IFRAF)
- ANR [08-BLAN-0165-01]
- Marie Curie Fellowship [EDUG-038970]
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We consider two-component one-dimensional quantum gases with a density imbalance. While generically such fluids are two-component Luttinger liquids, we show that if the ratio of the densities is a rational number, p/q, and mass asymmetry between components is sufficiently strong, one of the two eigenmodes acquires a gap. The gapped phase corresponds to (algebraic) ordering of (p+q)-particle composites. In particular, for attractive mixtures, this implies that the superconducting correlations are destroyed. We illustrate our predictions by numerical simulations of the fermionic Hubbard model with hopping asymmetry.
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