Research Article

Fermionic Superfluidity with Imbalanced Spin Populations

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Science  27 Jan 2006:
Vol. 311, Issue 5760, pp. 492-496
DOI: 10.1126/science.1122318

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Abstract

We established superfluidity in a two-state mixture of ultracold fermionic atoms with imbalanced state populations. This study relates to the long-standing debate about the nature of the superfluid state in Fermi systems. Indicators for superfluidity were condensates of fermion pairs and vortices in rotating clouds. For strong interactions, near a Feshbach resonance, superfluidity was observed for a broad range of population imbalances. We mapped out the superfluid regime as a function of interaction strength and population imbalance and characterized the quantum phase transition to the normal state, known as the Pauli limit of superfluidity.

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