摘要翻译:
本文给出了二维4He中一种新的亚稳超流相的扩散蒙特卡罗(DMC)结果,其密度>0.0651/a^2。态是各向异性的,具有正六轨道序。这意味着液-固相变有两个阶段:从各向同性超流体到六相超流体的二级相变,然后是将原子局域化到三角晶级的一级相变。这种亚稳六相具有有限的凝析油分数,它为超晶界中的超流动提供了一个自然的解释。
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英文标题:
《Structure of metastable 2D liquid helium》
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作者:
V. Apaja and M. Saarela
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最新提交年份:
2008
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分类信息:
一级分类:Physics 物理学
二级分类:Other Condensed Matter 其他凝聚态物质
分类描述:Work in condensed matter that does not fit into the other cond-mat classifications
在不适合其他cond-mat分类的凝聚态物质中工作
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一级分类:Physics 物理学
二级分类:Statistical Mechanics 统计力学
分类描述:Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变,热力学,场论,非平衡现象,重整化群和标度,可积模型,湍流
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英文摘要:
We present diffusion Monte Carlo (DMC) results on a new metastable, superfluid phase above the crystal ground state in two-dimensional 4He at densities > 0.065 1/A^2. The state is anisotropic with hexatic orbital order. This implies that the liquid--solid phase transition has two stages: A second order phase transition from the isotropic superfluid to the hexatic superfluid, followed by a first order transition that localizes atoms into the triangular crystal order. This metastable hexatic phase has finite condensate fraction and it provides a natural explanation for the superflow in the supersolid grain boundaries.
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PDF链接:
https://arxiv.org/pdf/711.0098