Rights statement: © 2010 The American Physical Society
Final published version, 232 KB, PDF document
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Article number | 065301 |
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<mark>Journal publication date</mark> | 12/02/2010 |
<mark>Journal</mark> | Physical review letters |
Issue number | 6 |
Volume | 104 |
Number of pages | 4 |
Pages (from-to) | - |
Publication Status | Published |
<mark>Original language</mark> | English |
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(up arrow) = n(down arrow)/2 an energy gap appears, implying that the gas is a one-component Luttinger liquid of trimers with suppressed superfluid correlations. The boundaries of this novel phase are given. We discuss experimental situations to test our predictions.