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Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
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分子斯-爱因斯坦凝结体中的散射超流动性

Hongchao Li1, Xie-Hang Yu2,3, Masaya Nakagawa1

  • 1The University of Tokyo, Department of Physics, 7-3-1 Hongo, Tokyo 113-0033, Japan.

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在斯-爱因斯坦凝聚物 (BEC) 中的消散可以在没有排斥性相互作用的情况下诱导超流体运输. 这项研究探讨了二极分子BEC中双体损失如何增强稳定性,揭示了量子系统的新可能性.

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科学领域:

  • 量子物理学的量子物理学
  • 凝聚物质物理学 凝聚物质物理学

背景情况:

  • 最近使用二极分子实验实现波斯-爱因斯坦凝聚物 (BECs).
  • 了解散散量子系统中的超流动性.

研究的目的:

  • 为消散性BEC开发超流体运输理论.
  • 调查两体损失在诱导相位刚性的作用.
  • 探索散射对分子BECs稳定性的影响.

主要方法:

  • 在散热BEC中超流体运输的理论建模.
  • 对于消散超流体来说,推导一个通用的f-sum规则.
  • 在散射系统中分析U(1) 对称性.

主要成果:

  • 弱均的两体损失诱导相刚性,使得超流体的运输没有排斥性相互作用.
  • 推导出一个通用的f-sum规则,因为弱的U(1) 对称性而持有消耗性超流体.
  • 分散增强了分子BECs与二极相互作用的稳定性.

结论:

  • 消散效应可以导致BECs的新型超流体特性.
  • 这些发现为双极分子BECs的行为提供了洞察力.
  • 确定了消散超流动性的潜在实验特征.