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Confinement vs Deconfinement of Cooper Pairs in One-Dimensional Spin-3/2 Fermionic Cold Atoms | S. Capponi
; G. Roux
; P. Azaria
; E. Boulat
; P. Lecheminant
; | Date: |
18 Dec 2006 | Subject: | Strongly Correlated Electrons; Superconductivity | Abstract: | The phase diagram of spin-3/2 fermionic cold atoms trapped in a one-dimensional optical lattice is investigated at quarter filling (one atom per site) by means of large-scale numerical simulations. In full agreement with a recent low-energy approach, we find two phases with confined and deconfined Cooper pairs separated by an Ising quantum phase transition. The leading instability in the confined phase is an atomic-density wave with subdominant quartet superfluid instability made of four fermions. At sufficiently low densities, we find that the quartet instability dominates and marks the onset of a nematic Luttinger liquid phase associated to the pairing of Cooper pairs. | Source: | arXiv, cond-mat/0612456 | Services: | Forum | Review | PDF | Favorites |
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