High temperature expansion applied to fermions near Feshbach resonance.
High temperature expansion applied to fermions near Feshbach resonance.
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DOI：
10.1103/physrevlett.92.160404
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发表时间：
2003-06
影响因子：
8.6
通讯作者：
T. Ho;E. Mueller
中科院分区：
文献类型：
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作者：
T. Ho;E. Mueller
我们表明，除了尺度上的差异外，所有最近观察到的靠近费什巴赫共振的简并费米气体的令人惊讶的性质在高温玻尔兹曼状态下仍然存在。在这种状态下，费什巴赫共振没有移位。通过扫过共振，可以可逆地生成束缚态（分子）的热分布。在整个过程中，相互作用能是负的，并且是连续的。我们还表明，除非随着温度降低而发生相变，否则这种行为必须在较低的温度下保持不变。我们严格地证明了共振附近的普遍行为。
We show that, apart from a difference in scale, all of the surprising recently observed properties of a degenerate Fermi gas near a Feshbach resonance persist in the high temperature Boltzmann regime. In this regime, the Feshbach resonance is unshifted. By sweeping across the resonance, a thermal distribution of bound states (molecules) can be reversibly generated. Throughout this process, the interaction energy is negative and continuous. We also show that this behavior must persist at lower temperatures unless there is a phase transition as the temperature is lowered. We rigorously demonstrate universal behavior near the resonance.