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一种稀释的磁量子液体的自结滴
Matthias Schmitt1, Matthias Wenzel1, Fabian Böttcher1
15. Physikalisches Institut and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.
Nature
|November 11, 2016
概括
研究人员观察到由超冷原子形成的新型自结合量子滴. 这些稀释的磁性量子液体是由于力量平衡而存在的,
科学领域:
- 原子,分子和光学物理学
- 凝聚物质物理学
- 量子多体系统
背景情况:
- 自结合的系统,就像液滴一样, 产生于平衡的粒子间力量.
- 超冷原子组合需要超出简单接触力的特定相互作用才能稳定.
- 之前的研究表明双极相互作用可以稳定超冷原子滴.
研究的目的:
- 通过实验观察磁性原子的三维自结合量子滴.
- 研究这些稀释量子液体的形成和稳定性所需的条件.
- 在超冷原子系统中探索气态和液态之间的相位过渡.
主要方法:
- 使用无陷的浮力场对磁性原子.
- 形成一个稀释的玻色二极气体,
- 在不同原子数和量子退化状态中观察原子组合的行为.
主要成果:
- 在一个悬浮的磁性原子气体中成功观察了三维自结合的量子滴.
- 确定液滴形成所需的关键原子数,低于此数,系统会蒸发.
- 从气体到液体的相互作用驱动的相位过渡在临界原子数附近的演示.
结论:
- 超冷的磁原子可以形成稳定的稀释量子滴, 通过双极和排斥的多体相互作用稳定.
- 这些液滴代表了一种新型的自结合量子物质,
- 这项研究揭示了由退化状态的相互作用驱动的量子相位过渡,
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