He-4在石墨上第二层的超流转变：衬底的质量重要吗？
Superfluid transition of the second layer of He-4 on graphite: does substrate corrugation matter?
摘要：
用量子蒙特卡罗模拟研究了He-4在石墨衬底上的第二层吸附。我们充分考虑到它的反射率，利用一个微观模型的基板，并比较与一个光滑的基板所获得的结果。在零温度的极限下，对流层的唯一影响是顶层超流部分的值减少了~20%。没有发现任何相称的（7/12）结晶和/或“超固体”相的证据;超流转变温度估计为~ 0.75 K。我们讨论了最近的实验解释这些发现的含义。
英文摘要：
The second layer of He-4 adsorbed on a graphite substrate is studied by Quantum Monte Carlo simulations. We make use of a microscopic model of the substrate fully accounting for its corrugation, and compare the results to those obtained with a smooth substrate. The only effect of corrugation is a ~20% reduction of the value of the superfluid fraction of the top layer, in the limit of zero temperature. No evidence of any commensurate (7/12) crystalline and/or "supersolid" phase is found; the superfluid transition temperature is estimated to be ~ 0.75 K. We discuss the implication of these findings on the interpretation of recent experiments.
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