Multi-particle composites in density-imbalanced quantum fluids

Details Multi-particle composites in density-imbalanced quantum fluids Multi-particle composites in density-imbalanced quantum fluids

2009-04-03

arxiv.org/abs/0904.0569v2

Phys. Rev. Lett. 103, 215301 (2009)

Physics

Condensed Matter

Quantum Gases

4+ pages, 1 figure, published version

Scientific paper

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. We illustrate our predictions by numerical simulations of the fermionic Hubbard model with hopping asymmetry.

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