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Strong-coupling corrections to ground-state properties of a superfluid Fermi gas

机译:超流度FERMI气体的地面性质的强耦合校正

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摘要

We theoretically present an economical and convenient way to study ground-state properties of a strongly interacting superfluid Fermi gas. Our strategy is that complicated strong-coupling calculations are used only to evaluate quantum fluctuation corrections to the chemical potential μ. Then, without any further strong-coupling calculations, we calculate the compressibility, sound velocity, internal energy, pressure, and Tan’s contact, from the calculated μ without loss of accuracy, by using exact thermodynamic identities. Using a recent precise measurement of μ in a superfluid ~6Li Fermi gas, we show that an extended T -matrix approximation (ETMA) is suitable for our purpose, especially in the BCS-unitary regime, where our results indicate that many-body corrections are dominated by superfluid fluctuations. Since precise determinations of physical quantities are not always easy in cold Fermi gas physics, our approach would greatly reduce experimental and theoretical efforts toward the understanding of ground-state properties of this strongly interacting Fermi system.
机译:理论上我们提出了一种研究强烈相互作用的超流体气体的地面性质的经济方便的方法。我们的策略是,复杂的强耦合计算仅用于评估对化学势μ的量子波动校正。然后,在没有任何进一步的强耦合计算的情况下,我们通过使用精确的热力学标识来计算从计算的μ计算压缩性,声速,内部能量,压力和TAN的接触,而不会损失精度。在Superfluid〜6Li Fermi气体中使用近期μ的精确测量,我们表明延长的T-MAT​​RIX近似(ETMA)适用于我们的目的,特别是在BCS酉制度中,我们的结果表明许多身体更正以超级流动波动为主。由于在寒冷的费米气体物理学中,物理量的精确确定并不总是容易,因此我们的方法将大大减少对这种强烈互动的费米系统的地面性质的理解的实验和理论努力。

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