Stable Topological Superfluid Phase of Ultracold Polar Fermionic Molecules

N. R. Cooper 1, 2, G. V. Shlyapnikov 2, 3

Physical Review Letters 103 (2009) 155302

We show that single-component fermionic polar molecules confined to a 2D geometry and dressed by a microwave field, may acquire an attractive $1/r^3$ dipole-dipole interaction leading to superfluid p-wave pairing at sufficiently low temperatures even in the BCS regime. The emerging state is the topological $p_x+ip_y$ phase promising for topologically protected quantum information processing. The main decay channel is via collisional transitions to dressed states with lower energies and is rather slow, setting a lifetime of the order of seconds at 2D densities $\sim 10^8$ cm$^{-2}$.

  • 1. TCM Group, Cavendish Laboratory,
    Cavendish Laboratory Cambridge
  • 2. Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS),
    CNRS : UMR8626 – Université Paris XI - Paris Sud
  • 3. Van der Waals-Zeeman Institute,
    University of Amsterdam