耗散原子介质中从扩散到非遍历的偶极输运
Diffusive to non-ergodic dipolar transport in a dissipative atomic medium
摘要：
我们研究了偶极介导的里德堡杂质通过超冷原子气体的输运。在一个实验中，我们通过将辅助里德伯态耦合到实现耗散介质的快速衰减态来连续探测系统。杂质的原位成像揭示了由探测激光的强度控制的扩散扩散。通过准备相同密度的跳跃伙伴，但随后关闭修整场，有效地冻结了扩散。这是一致的数值模拟表明，相干演化系统进入一个非遍历扩展阶段，由于无序。这为研究长程跳跃和可控耗散系统中的输运和局域化现象开辟了道路。
英文摘要：
We investigate the dipole mediated transport of Rydberg impurities through an ultracold gas of atoms excited to an auxiliary Rydberg state. In one experiment we continuously probe the system by coupling the auxiliary Rydberg state to a rapidly decaying state which realizes a dissipative medium. In-situ imaging of the impurities reveals diffusive spreading controlled by the intensity of the probe laser. By preparing the same density of hopping partners but then switching off the dressing fields the spreading is effectively frozen. This is consistent with numerical simulations which indicate the coherently evolving system enters a non-ergodic extended phase due to disorder. This opens the way to study transport and localization phenomena in systems with long-range hopping and controllable dissipation.
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