论文标题
费米极化物的拉曼光谱法
Raman spectroscopy of Fermi polarons
论文作者
论文摘要
通过使用非自愿的多体$ t $ -matrix理论，我们计算了在三个维度中浸入费米浴中的移动杂质的有限温度拉曼光谱。拉曼光谱对转移的动量，温度和杂质浴的相互作用的依赖性进行了详细讨论。我们确认，拉曼光谱中的峰值对杂质浓度的依赖性较弱，而射频光谱的峰值由于未预期的非零转移动量而引起的射频光谱。我们将理论预测与Gal ness \ textsl {et al。}的最新测量进行了比较。在弱耦合时，我们发现了良好的定量协议。但是，接近Feshbach共鸣的协议变得更糟。在强耦合时，我们发现可能需要一个不切实际的费米浴温度，以说明实验数据。
By using a non-self-consistent many-body $T$-matrix theory, we calculate the finite-temperature Raman spectroscopy of a mobile impurity immersed in a Fermi bath in three dimensions. The dependences of the Raman spectrum on the transferred momentum, temperature, and impurity-bath interaction are discussed in detail. We confirm that the peak in the Raman spectrum shows a weaker dependence on the impurity concentration than that in the radio-frequency spectroscopy, due to the nonzero transferred momentum, as anticipated. We compare our theoretical prediction with the recent measurement by Gal Ness \textsl{et al.} in Physical Review X \textbf{10}, 041019 (2020) without any adjustable parameters. At weak coupling, we find a good quantitative agreement. However, close to the Feshbach resonance the agreement becomes worse. At strong coupling, we find that an unrealistic Fermi bath temperature might be needed, in order to account for the experimental data.
