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arXiv 0912.4205cond-mat.quant-gas
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原子费米气体中的粒子数和质量不平衡

Population and mass imbalance in atomic Fermi gases

J. E. Baarsma, K. B. Gubbels, H. T. C. Stoof

摘要:

我们发展了一个精确的自旋和质量不平衡的共振相互作用费米混合物的理论。我们考虑费米混合物与任意的质量不平衡,但重点特别是在实验上可用的${}^{6}$锂- ${}^{40}$ K混合物。我们确定的相图的混合物的不同的相互作用强度,躺在BCS侧的费什巴赫共振。我们还确定了在么正性下的普适相图。我们发现的混合物具有足够大的质量不平衡,其中包括${}^{6}$锂- ${}^{40}$ K的混合物,在通用相图中的Lifshitz点,信号对超固相的不稳定性。

英文摘要:

We develop an accurate theory of resonantly interacting Fermi mixtures with both spin and mass imbalance. We consider Fermi mixtures with arbitrary mass imbalances, but focus in particular on the experimentally available ${}^{6}$Li-${}^{40}$K mixture. We determine the phase diagram of the mixture for different interactions strengths that lie on the BCS side of the Feshbach resonance. We also determine the universal phase diagram at unitarity. We find for the mixtures with a sufficiently large mass imbalance, that includes the ${}^{6}$Li-${}^{40}$K mixture, a Lifshitz point in the universal phase diagram that signals an instability towards a supersolid phase.

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