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Phys. Rev. A 77, 013624 (2008) [4 pages]

Molecular superfluid phase in systems of one-dimensional multicomponent fermionic cold atoms

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S. Capponi1,*, G. Roux1, P. Lecheminant2, P. Azaria3, E. Boulat4, and S. R. White5
1Laboratoire de Physique Théorique, IRSAMC, CNRS, Université Paul Sabatier, 31062 Toulouse, France
2Laboratoire de Physique Théorique et Modélisation, Université de Cergy-Pontoise, CNRS, 2 Avenue Adolphe Chauvin, 95302 Cergy-Pontoise, France
3Laboratoire de Physique Théorique de la Matiere Condensée, Université Pierre et Marie Curie, CNRS, 4 Place Jussieu, 75005 Paris, France
4Laboratoire Matériaux et Phénomènes Quantiques, Université Paris Diderot—Paris 7, CNRS, 75205 Paris Cedex 13, France
5Department of Physics and Astronomy, University of California, Irvine, California 92697, USA

Received 11 June 2007; published 30 January 2008

We study a simple model of N-component fermions with contact interactions which describes fermionic atoms with N=2F+1 hyperfine states loaded into a one-dimensional optical lattice. We show by means of analytical and numerical approaches that, for attractive interaction, a quasi-long-range molecular superfluid phase emerges at low density. In such a phase, the pairing instability is strongly suppressed and the leading instability is formed from bound states made of N fermions. At small density, the molecular superfluid phase is generic and exists for a wide range of attractive contact interactions without an SU(N) symmetry between the hyperfine states.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.77.013624
DOI:
10.1103/PhysRevA.77.013624
PACS:
03.75.Mn, 03.75.Ss, 71.10.Fd, 71.10.Pm

*capponi@irsamc.ups-tlse.fr

 
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