Fermionic superfluidity with imbalanced spin populations |
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Authors: | Zwierlein Martin W Schirotzek André Schunck Christian H Ketterle Wolfgang |
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Institution: | Department of Physics, Massachusetts Institute of Technology (MIT)-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, MIT, Cambridge, MA 02139, USA. zwierlei@mit.edu |
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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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