Coulomb anti-blockade in a Rydberg gas
Coulomb anti-blockade in a Rydberg gas
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DOI：
10.1088/1367-2630/ab1c0e
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发表时间：
2019-01
影响因子：
3.3
通讯作者：
A. Bounds;N. Jackson;R. Hanley;E. Bridge;P. Huillery;M. Jones
中科院分区：
文献类型：
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作者：
A. Bounds;N. Jackson;R. Hanley;E. Bridge;P. Huillery;M. Jones
本文对里德伯修饰原子气体与超冷等离子体之间的耦合进行了全面的研究。同时使用时间分辨测量中性原子和离子，我们表明，等离子体的形成发生通过库仑反封锁机制，其中背景离子DC斯塔克移动附近的原子在特定的距离共振。其结果是一个高度相关的增长的里德堡人口，共享一些相似之处，以前观察到的货车德瓦尔斯相互作用。我们表明，耦合的激光驱动的里德伯气体的UCP通过库仑反封锁机制的速率方程模型准确地再现了等离子体的形成和随后的衰变。使用长寿命的高角动量态作为探针，我们也发现了在高密度下从库仑反阻塞到库仑阻塞的交叉的证据。除了揭示里德伯修饰气体的损失机制外，我们的研究结果还为在UCP中创建低熵态开辟了新的途径。
We perform a comprehensive investigation of the coupling between a Rydberg-dressed atomic gas and an ultra-cold plasma (UCP). Using simultaneous time-resolved measurements of both neutral atoms and ions, we show that plasma formation occurs via a Coulomb anti-blockade mechanism, in which background ions DC Stark shift nearby atoms into resonance at specific distances. The result is a highly correlated growth of the Rydberg population that shares some similarities with that previously observed for van der Waals interactions. We show that a rate equation model that couples the laser-driven Rydberg gas to the UCP via a Coulomb anti-blockade mechanism accurately reproduces both the plasma formation and its subsequent decay. Using long-lived high angular momentum states as a probe, we also find evidence of a crossover from Coulomb anti-blockade to Coulomb blockade at high density. As well as shedding light on loss mechanisms in Rydberg-dressed gases, our results open new ways to create low-entropy states in UCPs.