论文标题
超低费米气体中超级流体发作的旋转敏感性
Spin Susceptibility Above the Superfluid Onset in Ultracold Fermi Gases
论文作者
论文摘要
可以调节超电原子的费米气体相互作用，在那里它们在超流体过渡上方显示了光谱特征，让人联想到丘比特中的伪造。但是，可以质疑类比的程度，因为可以使用费米液体理论成功地描述了低温自旋影响正常状态中的热力学量。在这里，我们使用具有Ultracold $^6 \ textrm {li} $气体的新型射频技术进行了旋转敏感性测量。对于所有显着的相互作用强度，在所有温度下，我们发现与非相互作用的费米气体的等效值相比，自旋敏感性降低了，低温结果与先前的研究一致。但是，我们的测量值扩展到较高的温度，我们发现减少持续存在于平均场景中。在单位性下，我们可以使用局部密度近似来提取均匀气体的自旋敏感性，从超氟过渡到费米温度的温度下，平均场模型很好地描述了这一点。
Ultracold atomic Fermi gases can be tuned to interact strongly, where they display spectroscopic signatures above the superfluid transition reminiscent of the pseudogap in cuprates. However, the extent of the analogy can be questioned, since thermodynamic quantities in the low temperature spin-imbalanced normal state can be described successfully using Fermi liquid theory. Here we present spin susceptibility measurements across the interaction strength-temperature phase diagram using a novel radiofrequency technique with ultracold $^6\textrm{Li}$ gases. For all significant interaction strengths and at all temperatures we find the spin susceptibility is reduced compared with the equivalent value for a non-interacting Fermi gas, with the low temperature results consistent with previous studies. However, our measurements extend to higher temperatures, where we find that the reduction persists consistently with a mean-field scenario. At unitarity, we can use the local density approximation to extract the spin susceptibility for the uniform gas, which is well described by mean-field models at temperatures from the superfluid transition to the Fermi temperature.
