石墨表面~ 3 He第二层中的流体相和记录相
Fluid and registered phases in the second layer of 3He on graphite
摘要：
本文采用量子蒙特卡罗方法，考虑了He原子的各种非线性效应，计算了He原子在石墨表面吸附的第二层$^3$的完整相图。我们发现第一层三角形固体与第二层气体处于平衡状态。在表面密度$0.166 \pm 0.001$ = $^{-2}$时，该流体变成两个第一层记录相：4/7和7/12固体。当进一步氦加载时，7/12排列转变为$ρ= 0.189 \pm 0.001$双$^{-2}$的无公度三角形结构。最近提出的六角相被发现是不稳定的，相对于这些相称的固体。
英文摘要：
A quantum Monte Carlo approach, considering all the corrugation effects, was used to calculate the complete phase diagram of the second $^3$He layer adsorbed on graphite. We found that a first-layer triangular solid was in equilibrium with a gas in the second layer. At a surface density $0.166 \pm 0.001$ Å$^{-2}$, this fluid changes into two first-layer registered phases: 4/7 and 7/12 solids. The 7/12 arrangement transforms into an incommensurate triangular structure of $ρ= 0.189 \pm 0.001$ Å$^{-2}$ upon further helium loading. A recently proposed hexatic phase was found to be unstable with respect to those commensurate solids.
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