Stability and pairing in quasi-one-dimensional Bose-Fermi mixtures

F. M. Marchetti 1, Th. Jolicoeur 2, M. M. Parish 3

Physical Review Letters 103 (2009) 105304

We consider a mixture of single-component bosonic and fermionic atoms in an array of coupled one-dimensional 'tubes'. For an attractive Bose-Fermi interaction, we show that the system exhibits phase separation instead of the usual collapse. Moreover, above a critical inter-tube hopping, all first-order instabilities disappear in both attractive and repulsive mixtures. The possibility of suppressing instabilities in this system suggests a route towards the realization of paired phases, including a superfluid of p-wave pairs unique to the coupled-tube system, and quantum critical phenomena.

  • 1. Departamento de Fisica Teorica de la Materia Condensada,
    Universidad Autónoma de Madrid
  • 2. Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS),
    CNRS : UMR8626 – Université Paris XI - Paris Sud
  • 3. Princeton Center for Theorical Science,
    Princeton University