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arXiv 2212.08705physics.atom-phcond-mat.quant-gas
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大型磁光阱中的非平衡稳态

Nonequilibrium steady state in a large magneto-optical trap

Marius Gaudesius, Yong-Chang Zhang, Thomas Pohl, Guillaume Labeyrie, Robin Kaiser

摘要:

考虑磁光阱(MOT)中冷原子之间的光介导长程相互作用,我们给出了足够大原子数(> 10 ^8)时存在非平衡稳态的数值证据。当MOT接近阈值时,这种状态表现为速度的各向异性分布的出现,超过阈值会发生自振荡不稳定性。我们的三维(3D)时空模型与非局部空间依赖性源于原子间的相互作用最近已成功地进行了比较,以预测不同的不稳定性阈值和制度的实验与铷原子。NESS的行为作为主要MOT参数的函数进行了研究,包括其时空特性。

英文摘要:

Considering light-mediated long-range interactions between cold atoms in a magneto-optical trap (MOT), we present numerical evidence of a nonequilibrium steady state (NESS) for sufficiently large number of atoms (> 10^8). This state manifests itself as the appearance of an anisotropic distribution of velocity when a MOT approaches the threshold beyond which self-oscillating instabilities occur. Our three-dimensional (3D) spatiotemporal model with nonlocal spatial dependencies stemming from the interatomic interactions has recently been compared successfully to predict different instability thresholds and regimes in experiments with rubidium atoms. The behavior of the NESS is studied as a function of the main MOT parameters, including its spatiotemporal characteristics.

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