近铁磁费米气体的自旋涨落、磁化率和偶极振荡
Spin fluctuations, susceptibility and the dipole oscillation of a nearly ferromagnetic Fermi gas
摘要：
讨论了正散射长度下原子费米气体相互作用中自旋涨落和磁化率的作用。热和量子涨落被认为是。使用求和规则的方法和最近的{ \it ab initio} Monte Carlo结果的磁化率均匀的物质，我们提供了明确的预测的频率的自旋偶极振荡的气体被捕获的谐波势和讨论的偏差时，系统接近铁磁转变的行为的理想气体。本文还讨论了朗道参数在磁性表征中的作用。
英文摘要：
We discuss the spin fluctuations and the role played by the magnetic susceptibility in an atomic Fermi gas interacting with positive scattering length. Both thermal and quantum fluctuations are considered. Using a sum rule approach and recent {\it ab initio} Monte Carlo results for the magnetic susceptibility of uniform matter we provide explicit predictions for the frequency of the spin dipole oscillation of a gas trapped by a harmonic potential and discuss the deviations from the behaviour of an ideal gas when the system approaches the ferromagnetic transition. The role of the Landau's parameters in the characterization of the magnetic properties is also discussed.
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