2009/04/30 by Evgeni Burovski, Giuliano Orso, Thierry Jolicoeur · 1 citation
Physics and Astronomy · #cond-mat.quant-gas #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.103.215301
published as Phys. Rev. Lett. 103, 215301 (2009) · 4+ pages, 1 figure, published version
arxiv created 2009/11/17 · arxiv updated 2015/05/13
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.