Rotating Ground States of a One-Dimensional Spin-Polarized Gas of Fermionic Atoms with Attractive p-Wave Interactions on a Mesoscopic Ring

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M. D. Girardeau¹ and E. M. Wright^1,2
¹College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA
²Department of Physics, University of Arizona, Tucson, Arizona 85721, USA

Received 7 November 2007; revised 2 January 2008; published 20 May 2008

Themajor finding of this Letter is that a one-dimensional spin-polarizedgas composed of an even number of fermionic atoms interactingvia attractive p-wave interactions and confined to a mesoscopic ringhas a degenerate pair of ground states that are oppositelyrotating. In any realization the gas will be measured torotate one way or the other in spite of thefact that there is no external rotation or bias fields.Our goal is to show that this counterintuitive finding isa natural consequence of the combined effects of quantum statistics,ring topology, and exchange interactions.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.100.200403
DOI:	10.1103/PhysRevLett.100.200403
PACS:	05.30.Fk; 03.75.Ss 05.30.Fk Fermion systems and electron gas (quantum statistical mechanics) 03.75.Ss Degenerate Fermi gases YEAR: 2008

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Phys. Rev. Lett. 100, 200403 (2008) [4 pages]

Rotating Ground States of a One-Dimensional Spin-Polarized Gas of Fermionic Atoms with Attractive p-Wave Interactions on a Mesoscopic Ring

REFERENCES (22)

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A new free weekly publication from APS