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- W2567472007 abstract "We experimentally determined various thermodynamic quantities of interacting two-component fermions at the zero-temperature limit from the Bardeen-Cooper-Schrieffer (BCS) region to the unitarity limit. The obtained results are very accurate in the sense that the systematic error is within 4% around the unitarity limit. Using this advantage, we can compare our data with various many-body theories. We found that an extended ${it T}$-matrix approximation, which is a strong-coupling theory involving fluctuations in the Cooper channel, well reproduces our experimental results. We also found that the superfluid order parameter ${it Delta}$ calculated by solving the ordinary BCS gap equation with the chemical potential of interacting fermions is close to the binding energy of the paired fermions directly observed in a spectroscopic experiment and that obtained using a quantum Monte Carlo method. Since understanding the strong-coupling properties of a superfluid Fermi gas in the BCS-BEC (Bose-Einstein condensation) crossover region is a crucial issue in condensed matter physics and nuclear physics, the results of the present study are expected to be useful in the further development of these fields." @default.
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- W2567472007 date "2017-10-11" @default.
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- W2567472007 title "Ground-State Thermodynamic Quantities of Homogeneous Spin- <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mn>1</mml:mn><mml:mo stretchy=false>/</mml:mo><mml:mn>2</mml:mn></mml:math> Fermions from the BCS Region to the Unitarity Limit" @default.
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- W2567472007 doi "https://doi.org/10.1103/physrevx.7.041004" @default.
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