论文标题
稀释液（n）费米气体中的巡回铁磁
Itinerant ferromagnetism in dilute SU(N) Fermi gases
论文作者
论文摘要
我们提出了SU（N）排斥性费米气体能量的精确分析结果，这是气体参数中二阶自旋通道占用的函数。这是旧结果的扩展，现在结合了系统的极化程度。因此，可以获得无数值不确定性的磁性特性。对于自旋1/2，我们发现二阶校正将流动的铁磁过渡从连续到一阶变化。相反，对于大于1/2的旋转，相变始终是一阶类型。当自旋增加时，过渡临界密度会降低，从而使相变的超速稀释费米气体更容易访问。据报道，YB和SR的Fermi气体的估计分别为自旋5/2和9/2。
We present exact analytic results for the energy of a SU(N) repulsive Fermi gas as a function of the spin-channel occupation at second order in the gas parameter. This is an extension of an old result that now incorporates the degree of polarization of the system. Therefore, the magnetic properties of the gas can be obtained, free from numerical uncertainties. For spin 1/2 we find that second-order corrections change the itinerant ferromagnetic transition from continuous to first-order. Instead, for spin larger than 1/2 the phase transition is always of first-order type. The transition critical density reduces when the spin increases, making the phase transition more accessible to experiments with ultracold dilute Fermi gases. Estimations for Fermi gases of Yb and Sr with spin 5/2 and 9/2, respectively, are reported.
