论文标题
二维排斥性费米极化子中的有限范围效应
Finite-range effects in the two-dimensional repulsive Fermi polaron
论文作者
论文摘要
我们研究了由$^{173} $ yb原子的最新实验的结果启发的两个组件的二维原子系统中的排斥性费米极化。 Darkwah oppong \ textit {et al。}，物理。莱特牧师。 \ textbf {122}，193604（2019）]。我们使用扩散的蒙特卡洛方法报告该实验中已测量的北极能量和准粒子残基等特性。为了洞悉问题的准粒子特征，我们还报告了有效质量的结果。我们表明，为了重现实验结果，需要有效范围以及散射长度。使用不同的模型电位来实现费米海与杂质之间的相互作用，我们表明可以根据这两个参数建立普遍性的状态，其中包括整个实验性制度。这说明了量子波动和超出均值场效应的相关性，以正确描述费米极化物问题。
We study the repulsive Fermi polaron in a two-component, two-dimensional system of fermionic atoms inspired by the results of a recent experiment with $^{173}$Yb atoms [N. Darkwah Oppong \textit{et al.}, Phys. Rev. Lett. \textbf{122}, 193604 (2019)]. We use the diffusion Monte Carlo method to report properties such as the polaron energy and the quasi-particle residue that have been measured in that experiment. To provide insight on the quasi-particle character of the problem, we also report results for the effective mass. We show that the effective range, together with the scattering length, is needed in order to reproduce the experimental results. Using different model potentials for the interaction between the Fermi sea and the impurity, we show that it is possible to establish a regime of universality, in terms of these two parameters, that includes the whole experimental regime. This illustrates the relevance of quantum fluctuations and beyond mean-field effects to correctly describe the Fermi polaron problem.
