仲氢团簇的局域超流性
Local Superfluidity of Parahydrogen Clusters
摘要：
我们用量子蒙特卡罗模拟方法研究了温度低至0.05 K时，小分子（最多27个分子）仲氢团簇的局部超流响应。我们表明，在低温下，超流性并不局限于表面的集群，最近声称由Khairallah等人。98，183401（2007）]。更确切地说，即使是具有明显壳结构的星系团也基本上是均匀超流体的。超流性是所有分子长时间交换的结果。
英文摘要：
We study by Quantum Monte Carlo simulations the local superfluid response of small (up to 27 molecules) parahydrogen clusters, down to temperatures as low as 0.05 K. We show that at low temperature superfluidity is not confined at the surface of the clusters, as recently claimed by Khairallah et al. [Phys. Rev. Lett. 98, 183401 (2007)]. Rather, even clusters with a pronounced shell structure are essentially uniformly superfluid. Superfluidity occurs as a result of long exchange cycles involving all molecules.
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