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SUMMARY:Multiparticle Composites in Density-Imbalanced Quantum Fluids - Ev
 geny Burovskiy (Université Paris-Sud)
DTSTART:20100701T131500Z
DTEND:20100701T141500Z
UID:TALK25408@talks.cam.ac.uk
CONTACT:19219
DESCRIPTION:We consider two-component one-dimensional quantum gases with a
  density\nimbalance. While generically such fluids are two-component Lutti
 nger\nliquids\, we show that if the ratio of the densities is a rational\n
 number\, p/q\, and mass asymmetry between components is sufficiently\nstro
 ng\, one of the two eigenmodes acquires a gap. The gapped phase\ncorrespon
 ds to (algebraic) ordering of (p+q)-particle composites. In\nparticular\, 
 for attractive mixtures\, this implies that the\nsuperconducting correlati
 ons are destroyed. We illustrate our\npredictions by numerical simulations
  of the fermionic Hubbard model\nwith hopping asymmetry. 
LOCATION:Meeting Room 11 (Malcolm Room)\, Pavilion B\, DAMTP\, CMS
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