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首页> 外文期刊>Physical review >Numerical study of incommensurability of the spiral state on spin-1/2 spatially anisotropic triangular antiferromagnets using entanglement renormalization
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Numerical study of incommensurability of the spiral state on spin-1/2 spatially anisotropic triangular antiferromagnets using entanglement renormalization

机译:自旋1/2空间各向异性三角反铁磁体上螺旋态不可共通性的纠缠重整化数值研究

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摘要

The ground state of an S - 1/2 antiferromagnetic Heisenberg model on a spatially anisotropic triangular lattice, which is an effective model of Mott insulators on a triangular layer of organic charge transfer salts or Cs_2CuCl_4, is numerically studied. We apply a numerical variational method by using a tensor network with entanglement renormalization, which improves the capability of describing a quantum state. Magnetic ground states are identified for 0.7 ≤ J_2/J_1 ≤ 1 in the thermodynamic limit, where J_1 and J_2 denote the innerchain and interchain coupling constants, respectively. Except for the isotropic case (J_1 - J_2), the magnetic structure is spiral with an incommensurate wave vector that is different from the classical one. The quantum fluctuation weakens the effective coupling between chains, but the magnetic order remains in the thermodynamic limit. In addition, the incommensurate wave number is in good agreement with that of the series expansion method.
机译:数值研究了空间各向异性三角晶格上S-1/2反铁磁Heisenberg模型的基态,该模型是有机电荷转移盐或Cs_2CuCl_4三角层上Mott绝缘子的有效模型。我们通过使用具有纠缠重归一化的张量网络来应用数值变分方法,从而提高了描述量子态的能力。在热力学极限中,磁性基态被确定为0.7≤J_2 / J_1≤1,其中J_1和J_2分别表示内链和链间耦合常数。除各向同性情况(J_1-J_2)外,磁结构是螺旋形的,其波矢量与经典的不一样。量子涨落削弱了链之间的有效耦合,但是磁阶保持在热力学极限内。另外,不相称的波数与级数展开法的波数非常吻合。

著录项

  • 来源
    《Physical review》 |2012年第18期|184421.1-184421.9|共9页
  • 作者

    Kenji Harada;

  • 作者单位

    Graduate School of Informatics, Kyoto University, Kyoto 606-8501, Japan;

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

    quantized spin models;

    机译:量化自旋模型;

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