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APS » Journals » Phys. Rev. Lett. » Volume 103 » Issue 15
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Phys. Rev. Lett. 103, 155302 (2009) [4 pages]

Stable Topological Superfluid Phase of Ultracold Polar Fermionic Molecules

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N. R. Cooper1,2 and G. V. Shlyapnikov2,3
1TCM Group, University of Cambridge, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
2Laboratoire de Physique Théorique et Modèles Statistiques, Université Paris Sud, CNRS, 91405 Orsay, France
3van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65/67, 1018 XE Amsterdam, The Netherlands

Received 17 July 2009; revised 16 September 2009; published 9 October 2009

We show that single-component fermionic polar molecules confined to a 2D geometry and dressed by a microwave field may acquire an attractive 1/r3 dipole-dipole interaction leading to superfluid p-wave pairing at sufficiently low temperatures even in the BCS regime. The emerging state is the topological px+ipy 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 ∼108  cm-2.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.155302
DOI:
10.1103/PhysRevLett.103.155302
PACS:
67.85.De, 03.65.Vf, 03.67.Lx, 03.75.Ss
 
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