2009

Multi-particle composites in density-imbalanced quantum fluids

Burovski, Evgeni, Orso, Giuliano, Jolicoeur, Thierry

Understand

We consider two-component one-dimensional quantum gases with 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.

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