Direct Observation of Atom-Ion Nonequilibrium Sympathetic Cooling.
Direct Observation of Atom-Ion Nonequilibrium Sympathetic Cooling.
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原子离子非平衡交感冷却的直接观察。
DOI：
10.1103/physrevlett.121.053402
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发表时间：
2018
影响因子：
8.6
通讯作者：
R. Ozeri
中科院分区：
文献类型：
--
作者：
Z. Meir;Meirav Pinkas;T. Sikorsky;Ruti Ben;N. Akerman;R. Ozeri
交感冷却是一个系统和较冷的浴缸之间的能量交换过程。我们在原子-离子实验中研究了这一基本过程。在原子-离子实验中，系统由囚禁在射频保罗陷阱中的单个离子组成，并以总能量为∼200 K的经典振荡运动制备，镀液是μK温度下的超冷原子云。在两个不同区域的一次到多次碰撞中，我们通过单次能量测量直接观察到了交感冷却动力学。在一种情况下，碰撞主要是通过非常有效的动量传递冷却系统，导致只有少数几次碰撞才会冷却。另一方面，在离子陷阱振荡电场的存在下，由于非平衡动力学，碰撞既可以冷却系统，也可以加热系统。虽然我们的大部分观测结果与硬球(朗之万)碰撞的分子动力学模拟很好地一致，但对散射角分布的测量揭示了超出朗之万模型的前向散射(掠射)碰撞。这项工作为利用控制良好的原子-离子系统进一步研究非平衡和碰撞动力学奠定了基础。
Sympathetic cooling is the process of energy exchange between a system and a colder bath. We investigate this fundamental process in an atom-ion experiment where the system is composed of a single ion trapped in a radio-frequency Paul trap and prepared in a classical oscillatory motion with total energy of ∼200 K, and the bath is an ultracold cloud of atoms at μK temperature. We directly observe the sympathetic cooling dynamics with single-shot energy measurements during one to several collisions in two distinct regimes. In one, collisions predominantly cool the system with very efficient momentum transfer leading to cooling in only a few collisions. In the other, collisions can both cool and heat the system due to nonequilibrium dynamics in the presence of the ion trap's oscillating electric fields. While the bulk of our observations agree well with a molecular-dynamics simulation of hard-sphere (Langevin) collisions, a measurement of the scattering angle distribution reveals forward-scattering (glancing) collisions which are beyond the Langevin model. This work paves the way for further nonequilibrium and collision dynamics studies using the well-controlled atom-ion system.
影响因子：
19.6
作者：
Ratschbacher, Lothar;Zipkes, Christoph;Koehl, Michael
通讯作者：
Koehl, Michael
自旋极化原子浴中单个离子自旋杂质的动力学
影响因子：
2.9
作者：
Henning Fürst;Thomas Feldker;Norman Vincenz Ewald;Jannis Joger;Michał Tomza;Rene Gerritsma
通讯作者：
Rene Gerritsma