Three-body correlations in a two-dimensional SU(3) Fermi gas
Three-body correlations in a two-dimensional SU(3) Fermi gas
复制标题
DOI：
10.1103/physreva.96.053614
复制
发表时间：
2017-04
影响因子：
2.9
通讯作者：
T. Kirk;M. Parish
中科院分区：
文献类型：
--
作者：
T. Kirk;M. Parish
我们考虑具有SU(3)对称性的二维费米气体。对于真实的冷原子气体实验，我们证明了准2D系统的相图可以用两个2D散射参数来表征：散射长度和有效射程。与三维(3D)的情况不同，我们认为准2D系统中的三体束缚态(三聚体)对三体损耗是稳定的。利用低密度展开和变分方法，我们研究了这种三聚体在多体系统中的命运，当吸引相互作用减少时(或者相反，随着粒子密度的增加)。我们发现，在弱耦合(高密度)极限下，三聚体残基可以以强三体关联的形式持续存在。
We consider a three-component Fermi gas that has SU(3) symmetry and is confined to two dimensions (2D). For realistic cold atomic gas experiments, we show that the phase diagram of the quasi-2D system can be characterized using two 2D scattering parameters: the scattering length and the effective range. Unlike the case in three dimensions (3D), we argue that three-body bound states (trimers) in the quasi-2D system can be stable against three-body losses. Using a low-density expansion coupled with a variational approach, we investigate the fate of such trimers in the many-body system as the attractive interactions are decreased (or, conversely, as the density of particles is increased). We find that remnants of trimers can persist in the form of strong three-body correlations in the weak-coupling (high-density) limit.