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Boundary effects in the density-matrix renormalization group calculation

机译:密度矩阵重归一化组计算中的边界效应

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摘要

We investigate the boundary effect of the density matrix renormalization group calculation (DMRG), which is an artifactual induction of symmetry-breaking pseudo-long-range order and takes place when the long-range quantum fluctuation cannot be properly included in the variational wave function due to numerical limitation. The open boundary condition often used in DMRG suffers from the boundary effect the most severely, which is directly reflected in the distinct spatial modulations of the local physical quantity. By contrast, the other boundary conditions such as the periodic one or the sin2-deformed interaction [A. Gendiar, R. Krcmar, and T. Nishino, Prog. Theor. Phys. 122, 953 (2009)] keep spatial homogeneity, and are relatively free from the boundary effect. By comparing the numerical results of those various boundary conditions, we show that the open boundary condition sometimes gives unreliable results even after the finite-size scaling. We conclude that the examination of the boundary condition dependence is required besides the usual treatment based on the system size or accuracy dependence in cases where the long-range quantum fluctuation is important.
机译:我们研究密度矩阵重归一化组计算(DMRG)的边界效应,该效应是对称破坏的伪远程序列的人为归纳,发生在不能将远距离量子涨落适当包含在变分波函数中的情况下由于数字限制。 DMRG中经常使用的开放边界条件最严重地受到边界效应的影响,这直接反映在局部物理量的不同空间调制中。相比之下,其他边界条件(例如周期性的或sin2变形的相互作用)[A。 Gendiar,R.Krcmar和T.Nishino,编。理论。物理122,953(2009)]保持空间均匀性,并且相对不受边界效应的影响。通过比较这些各种边界条件的数值结果,我们表明,即使在有限尺寸缩放之后,开放边界条件有时也会给出不可靠的结果。我们得出结论,在长距离量子涨落很重要的情况下,除了基于系统大小或精度依赖关系的常规处理之外,还需要检查边界条件依赖关系。

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  • 来源
    《Physical review》 |2011年第11期|p.255-263|共9页
  • 作者

    Naokazu Shibata; Chisa Hotta;

  • 作者单位

    Department of Physics, Tohoku University, Sendai 980-8578, Japan;

    Department of Physics, Kyoto Sangyo University, Kyoto 603-8555, Japan;

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