论文标题
浸入自旋1/2超氟的杂质的能量的平均场与RPA计算
Mean-field vs RPA calculation of the energy of an impurity immersed in a spin 1/2 superfluid
论文作者
论文摘要
在本文中，我们计算出杂质的能量，该杂质弱耦合到自旋1/2效率超基超氟。我们表明，只能使用对多体背景的激发的正确描述来治愈三体物理学产生的分歧。我们强调了在BCS（Bardeen-Cooper-Schrieffer）中被忽略的准粒子之间的相互作用所起的至关重要的作用。相比之下，我们证明它们使用随机相近似（RPA）的添加使我们能够使杂质的能量正常。最后，我们表明，应通过分析外部限制电势中质量振荡中心的频率转移来观察这些超出均值校正。
In this article we calculate the energy of an impurity weakly coupled to a spin 1/2 fermionic superfluid. We show that the divergences resulting from three-body physics can only be cured using a proper description of the excitations of the many-body background. We highlight the crucial role played by interactions between quasiparticles which are overlooked within BCS (Bardeen-Cooper-Schrieffer) mean-field theory of fermionic superfluidity. By contrast, we prove that their addition using the Random Phase Approximation (RPA) allows us to regularize the energy of the impurity. Finally, we show that these beyond mean-field corrections should be observable by the analysis of the frequency shift of the impurity center of mass oscillations in an external confining potential.
