Spin Imbalanced Quasi-Two-Dimensional Fermi Gases

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Thomas, John E

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Ong, Willie Chuin Hong

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2015-09-01T20:05:58Z

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2015-09-01T20:05:58Z

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2015

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Physics

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Spin-imbalanced Fermi gases serve as a testbed for fundamental notions and are efficient table-top emulators of a variety of quantum matter ranging from neutron stars, the quark-gluon plasma, to high critical temperature superconductors. A macroscopic quantum phenomenon which occurs in spin-imbalanced Fermi gases is that of phase separation; in three dimensions, a spin-balanced, fully-paired superfluid core is surrounded by an imbalanced normal-fluid shell, followed by a fully polarized shell. In one-dimension, the behavior is reversed; a balanced phase appears outside a spin-imbalanced core. This thesis details the first density profile measurements and studies on spin-imbalanced quasi-2D Fermi gases, accomplished with high-resolution, rapid sequential spin-imaging. The measured cloud radii and central densities are in disagreement with mean-field Bardeen-Cooper-Schrieffer theory for a 2D system. Data for normal-fluid mixtures are well fit by a simple 2D polaron model of the free energy. Not predicted by the model is an observed phase transition to a spin-balanced central core above a critical polarization.

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https://hdl.handle.net/10161/10530

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Physics

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Atomic physics

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Quantum physics

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Fermi gas

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polaron

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quasi-2D

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Spin imbalance

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Two Dimensional

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Spin Imbalanced Quasi-Two-Dimensional Fermi Gases

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Dissertation

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