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Mott-insulator to commensurate-solid transition in a ~4He layer on α-graphyne

机译:莫特-绝缘子在α-石墨烯上〜4He层中的等量固相转变

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摘要

Path-integral Monte Carlo calculations were performed to study the adsorption of ~4He atoms on α-graphyne. We find that one ~4He atom can be embedded onto the in-plane center of each hexagon of the graphyne. In the first ~4He layer above the ~4He-embedded graphyne surface, a Mott-insulating state was observed at an areal density of 0.0706 A~(-2) with three ~4He atoms occupying each hexagonal cell while the helium atoms form a commensurate triangular solid at a density of 0.0941 A~(-2). Here we show that the Ising pseudospin symmetry introduced for two degenerate configurations of three ~4He atoms in a hexagonal cell can be broken by additional ~4He atoms placed at the hexagon vertices, and the Mott-insulator to commensurate-solid transition is a transition from a nonmagnetic spin liquid of frustrated antiferromagnets to a spin-aligned ferromagnet under a particle-induced pseudomagnetic field.
机译:进行路径积分蒙特卡罗计算以研究〜4He原子在α-石墨烯上的吸附。我们发现一个〜4He原子可以嵌入到石墨烯每个六边形的平面中心。在〜4He嵌入的石墨烯表面上方的第一个〜4He层中,在0.0706 A〜(-2)的面密度下观察到Mott绝缘状态,三个〜4He原子占据了每个六角形单元,而氦原子形成了一个相称的密度为0.0941 A〜(-2)的三角形固体。在这里我们表明,六方晶胞中三个〜4He原子的两个简并构型引入的Ising伪自旋对称性可以被位于六边形顶点处的额外〜4He原子破坏,并且Mott-绝缘子向相称固相转变是从在粒子感应的伪磁场作用下,受挫反铁磁体的非磁性自旋液体变成自旋对准的铁磁体。

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  • 来源
    《Physical review》 |2013年第20期|201403.1-201403.5|共5页
  • 作者单位

    Division of Quantum Phases and Devices, School of Physics, Konkuk University, Seoul 143-701, Korea;

    Division of Quantum Phases and Devices, School of Physics, Konkuk University, Seoul 143-701, Korea;

    Division of Quantum Phases and Devices, School of Physics, Konkuk University, Seoul 143-701, Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    general theory and models of magnetic ordering;

    机译:电磁订购的一般理论和模型;

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