2009/07/31 by Giuliano Orso, Evgeni Burovski, Thierry Jolicoeur · 1 citation
Physics and Astronomy · #cond-mat.quant-gas #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.104.065301
published as Phys. Rev. Lett. 104, 065301 (2010) · 4 pages, 4 figures. Final accepted version
arxiv created 2010/02/15 · arxiv updated 2015/05/13
We investigate one dimensional attractive Fermi gases in spin-dependent optical lattices. 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 and 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 novel phase are given. We discuss experimental situations to test our predictions.