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Observation of Phase Separation in a Strongly-Interacting Imbalanced Fermi Gas

Y. Shin·M. W. Zwierlein·C. H. Schunck·A. Schirotzek·W. Ketterle
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Abstract

We have observed phase separation between the superfluid and the normal component in a strongly interacting Fermi gas with imbalanced spin populations. The in situ distribution of the density difference between two trapped spin components is obtained using phase-contrast imaging and 3D image reconstruction. A shell structure is clearly identified where the superfluid region of equal densities is surrounded by a normal gas of unequal densities. The phase transition induces a dramatic change in the density profiles as excess fermions are expelled from the superfluid.

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Y. Shin, M. W. Zwierlein, C. H. Schunck, A. Schirotzek, W. Ketterle. 2006-06-18. Observation of Phase Separation in a Strongly-Interacting Imbalanced Fermi Gas. https://doi.org/10.1103/physrevlett.97.030401

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