Nonlinear scattering of atomic bright solitons in disorder
Nonlinear scattering of atomic bright solitons in disorder
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无序原子亮孤子的非线性散射
DOI：
10.1209/0295-5075/117/10007
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
T. Bourdel
中科院分区：
文献类型：
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作者：
A. Boiss'e;G. Berthet;L. Fouch'e;G. Salomon;A. Aspect;S. Lepoutre;T. Bourdel
我们观察到在一维 (1D) 散斑无序中发射的 39K 原子亮孤子的非线性散射。我们直接将其与相同无序中非相互作用粒子的散射进行比较。与单散射体系中独立粒子的行为相反，孤子中的原子倾向于集体反射或透射，从而表现出明显的散射非线性效应。观察到的反射分数在 0 到 100% 之间的强烈波动被解释为系统对实验条件（特别是孤子速度）高度敏感的结果。这种行为通过 Gross-Pitaevskii 模拟在平均场框架中重现，并且对于我们的参数来说，完全反射和完全透射的孤子的介观量子叠加是不期望的。我们讨论了观察这种叠加的条件，这将在超出标准量子极限的原子干涉测量中找到应用。
We observe nonlinear scattering of 39K atomic bright solitons launched in a one-dimensional (1D) speckle disorder. We directly compare it with the scattering of non-interacting particles in the same disorder. The atoms in the soliton tend to be collectively either reflected or transmitted, in contrast with the behavior of independent particles in the singlescattering regime, thus demonstrating a clear nonlinear effect in scattering. The observed strong fluctuations in the reflected fraction, between zero and 100%, are interpreted as a consequence of the strong sensitivity of the system to the experimental conditions and in particular to the soliton velocity. This behavior is reproduced in a mean-field framework by Gross-Pitaevskii simulations, and mesoscopic quantum superpositions of the soliton being fully reflected and fully transmitted are not expected for our parameters. We discuss the conditions for observing such superpositions, which would find applications in atom interferometry beyond the standard quantum limit.