Fermionic Superfluidity with Imbalanced Spin Populations and the Quantum Phase Transition to the Normal State

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dc.creatorZwierlein, Martin W.
dc.creatorSchirotzek, André
dc.creatorSchunck, Christian H.
dc.creatorKetterle, Wolfgang
dc.date2005-11-08
dc.date.accessioned2026-07-07T06:45:56Z
dc.date.available2026-07-07T06:45:56Z
dc.descriptionWhether it occurs in superconductors, helium-3 or inside a neutron star, fermionic superfluidity requires pairing of fermions, particles with half-integer spin. For an equal mixture of two states of fermions ("spin up" and "spin down"), pairing can be complete and the entire system will become superfluid. When the two populations of fermions are unequal, not every particle can find a partner. Will the system nevertheless stay superfluid? Here we study this intriguing question in an unequal mixture of strongly interacting ultracold fermionic atoms. The superfluid region vs population imbalance is mapped out by employing two complementary indicators: The presence or absence of vortices in a rotating mixture, as well as the fraction of condensed fermion pairs in the gas. Due to the strong interactions near a Feshbach resonance, the superfluid state is remarkably stable in response to population imbalance. The final breakdown of superfluidity marks a new quantum phase transition, the Pauli limit of superfluidity.
dc.description15 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0511197
dc.identifierhttp://arxiv.org/abs/cond-mat/0511197
dc.identifierScience 311 (5760), 492-496 (2006); published online 22 December 2005 (in Science Express Research Articles)
dc.identifierdoi:10.1126/science.1122318
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/103185
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleFermionic Superfluidity with Imbalanced Spin Populations and the Quantum Phase Transition to the Normal State
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