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Phase Separation and Pair Condensation in a Spin-Imbalanced 2D Fermi Gas

Author(s): Mitra, Debayan; Brown, Peter T; Schauß, Peter; Kondov, Stanimir S; Bakr, Waseem S

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Abstract: We study a two-component quasi-two-dimensional Fermi gas with imbalanced spin populations. We probe the gas at different interaction strengths and polarizations by measuring the density of each spin component in the trap and the pair momentum distribution after time of flight. For a wide range of experimental parameters, we observe in-trap phase separation characterized by the appearance of a spinbalanced core surrounded by a polarized gas. Our momentum space measurements indicate pair condensation in the imbalanced gas even for large polarizations where phase separation vanishes, pointing to the presence of a polarized pair condensate. Our observation of zero momentum pair condensates in 2D spin-imbalanced gases opens the way to explorations of more exotic superfluid phases that occupy a large part of the phase diagram in lower dimensions.
Publication Date: 26-Aug-2016
Electronic Publication Date: 24-Aug-2016
Citation: Mitra, Debayan, Brown, Peter T, Schauß, Peter, Kondov, Stanimir S, Bakr, Waseem S. (2016). Phase Separation and Pair Condensation in a Spin-Imbalanced 2D Fermi Gas. Physical Review Letters, 117 (9), 10.1103/PhysRevLett.117.093601
DOI: doi:10.1103/PhysRevLett.117.093601
ISSN: 0031-9007
EISSN: 1079-7114
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review Letters
Version: Final published version. This is an open access article.

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