论文标题
在第二层的4He的超氟和超滤光粉相
Superfluid and supersolid phases of 4He on the second layer of graphite
论文作者
论文摘要
我们使用量子蒙特卡洛方法重新审视了石墨顶部4He的第二层的相图。我们的目的是探索最近在实验工作中提出的新阶段的存在，并确定其特性和稳定性限制。我们发现了具有近二相关性的超流体量子相的证据，这是由第一氦层的波纹和与7/12注册相对应的准二维超固体引起的。发现4/7相称的固体是不稳定的，而三角形不一致的晶体在大密度下稳定，是正常的。
We revisited the phase diagram of the second layer of 4He on top of graphite using quantum Monte Carlo methods. Our aim was to explore the existence of the novel phases suggested recently in experimental works, and determine their properties and stability limits. We found evidence of a superfluid quantum phase with hexatic correlations, induced by the corrugation of the first Helium layer, and a quasi-two-dimensional supersolid corresponding to a 7/12 registered phase. The 4/7 commensurate solid was found to be unstable, while the triangular incommensurate crystals, stable at large densities, were normal.
