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29 March 2024
 
  » arxiv » 0907.1533

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Luttinger liquid of trimers in Fermi gases with unequal masses
Giuliano Orso ; Evgeni Burovski ; Thierry Jolicoeur ;
Date 9 Jul 2009
AbstractWe investigate one dimensional attractive Fermi gases in spin-dependent optical lattices. Starting from the asymmetric Hubbard model, we show that three-body bound states - ’’trimers’’ - exist as soon as the two tunneling rates are different. We calculate the binding energy and the effective mass of a single trimer. We then show numerically that for finite commensurate densities $n_uparrow=n_downarrow/2$ an energy gap appears, implying that the gas is a one-component Luttinger liquid of trimers with suppressed superfluid ordering. The boundaries of this exotic phase are given.
Source arXiv, 0907.1533
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