Stability of the Repulsive Fermi Gas with Contact Interactions
Stability of the Repulsive Fermi Gas with Contact Interactions
复制标题
具有接触相互作用的排斥费米气体的稳定性
DOI：
10.1103/physrevlett.129.203402
复制
发表时间：
2022
影响因子：
8.6
通讯作者：
Navon, Nir
中科院分区：
文献类型：
--
作者：
Ji, Yunpeng;Schumacher, Grant L.;Assumpção, Gabriel G. T.;Chen, Jianyi;Mäkinen, Jere T.;Vivanco, Franklin J.;Navon, Nir
我们报告了具有接触相互作用的排斥准均质自旋费米气体的创建和稳定性研究。对于所探索的散射长度范围，衰变的主要机制是朝向费什巴赫束缚态的通用三体重组。我们观察到复合系数，其中第一个因素，即每个粒子的平均动能，来自三体阈值定律，第二个因素来自复合的普遍性。这两个缩放定律都是涉及两个相同费米子的三体碰撞中泡利阻塞效应的结果。由于费米统计与复合过程的动量依赖性之间的相互作用，系统在复合期间表现出不平凡的温度动力学，根据其初始量子简并性选择性地加热或冷却。的测量提供了均匀排斥费米气体在平衡状态下可实现的相互作用强度的上限。
We report the creation and the study of the stability of a repulsive quasihomogeneous spin-Fermi gas with contact interactions. For the range of scattering lengthsexplored, the dominant mechanism of decay is a universal three-body recombination toward a Feshbach bound state. We observe that the recombination coefficient, where the first factor, the average kinetic energy per particle, arises from a three-body threshold law, and the second one from the universality of recombination. Both scaling laws are consequences of Pauli blocking effects in three-body collisions involving two identical fermions. As a result of the interplay between Fermi statistics and the momentum dependence of the recombination process, the system exhibits nontrivial temperature dynamics during recombination, alternatively heating or cooling depending on its initial quantum degeneracy. The measurement ofprovides an upper bound for the interaction strength achievable in equilibrium for a uniform repulsive Fermi gas.