论文标题
He-4在石墨上的第二层的超流体过渡：底物波纹是否重要？
Superfluid transition of the second layer of He-4 on graphite: does substrate corrugation matter?
论文作者
论文摘要
通过量子蒙特卡洛模拟研究了在石墨底物上吸附在石墨基板上的第二层He-4。我们利用底物的显微镜模型充分考虑其波纹，并将结果与光滑的底物获得的结果进行比较。波纹的唯一影响是在零温度的极限下，顶层的超流体分数的值降低了约20％。找不到任何相称（7/12）结晶和/或“超诺”相的证据；估计超流体过渡温度为〜0.75K。我们讨论了这些发现对最近实验的解释的含义。
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.
