Competing orders in one-dimensional half-integer fermionic cold atoms: A conformal field theory approach |
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Authors: | P Lecheminant P Azaria E Boulat |
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Institution: | 1. Laboratoire de Physique Théorique et Modélisation, CNRS UMR 8089, Université de Cergy-Pontoise, Site de Saint-Martin, 2 avenue Adolphe Chauvin, 95302 Cergy–Pontoise Cedex, France;2. Laboratoire de Physique Théorique de la Matière Condensée, Université Pierre et Marie Curie, 4 Place Jussieu, 75256 Paris Cedex 05, France;3. Laboratoire Matériaux et Phénomènes Quantiques, CNRS UMR 7162, Université Paris Diderot, 75205 Paris Cedex 13, France |
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Abstract: | The physical properties of arbitrary half-integer spins F=N−1/2 fermionic cold atoms loaded into a one-dimensional optical lattice are investigated by means of a conformal field theory approach. We show that for attractive interactions two different superfluid phases emerge for F?3/2: A BCS pairing phase, and a molecular superfluid phase which is formed from bound-states made of 2N fermions. In the low-energy approach, the competition between these instabilities and charge-density waves is described in terms of ZN parafermionic degrees of freedom. The quantum phase transition for F=3/2,5/2 is universal and shown to belong to the Ising and three-state Potts universality classes respectively. In contrast, for F?7/2, the transition is non-universal. For a filling of one atom per site, a Mott transition occurs and the nature of the possible Mott-insulating phases are determined. |
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Keywords: | 71 10 Pm 75 10 Pq 03 75 Ss |
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