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Spin-wave study of entanglement and Renyi entropy for coplanar and collinear magnetic orders in two-dimensional quantum Heisenberg antiferromagnets

机译:共面缠结和仁义熵的旋转波研究,对二维量子Heisenberg反霉菌的二维量子磁性订单

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摘要

We use modified linear spin-wave theory (MLSWT) to study ground-state entanglement for a length-L line subsystem in L × L square- and triangular-lattice quantum Heisenberg antiferromagnets with coplanar spiral magnetic order with ordering vector Q = (q, q) and N_G = 3 Goldstone modes, except if q = n (collinear order, N_G = 2). Generalizing earlier MLSWT results for q = π to commensurate spiral order with s ≥ 3 sublattices (q = 2πr/s with r and s coprime), we find analytically for large L a universal and n-independent subleading term (N_G/2)lnL in the RtSnyi entropy S_n, associated with L~(1/2) scaling of λ_0 and λ_(±q), with λ_0 ≠ λ_(±q), for spiral order; here {λ_(ky)} are the L mode occupation numbers of the entanglement Hatniltonian. The term (3/2) In L in S_n agrees with a nonlinear sigma model study of s = 3 spiral order (q = 2π/3). These and oilier properties of S_n and λ_(ky) are explored numerically for an anisotropic nearest-neighbor triangular-lattice model for which q varies in the spiral phase.
机译:我们使用改进的线性旋转波理论(MLSWT)在L×L平方和三角形晶格Quantum Heisenberg反铁渣的Liment-L线子系统中研究地面纠缠,具有共同的螺旋磁场,订购矢量q =(q, q)和n_g = 3 goldstone模式,除了q = n(conlinear order,n_g = 2)。概括前面的Q =π的MLSWT结果与S≥3个子发布(Q =2πr/ s带有R和S COPRIME),我们发现大型L通用和N独立的外勤术语(N_G / 2)LNL在RTSNYI熵S_N中,与L〜(1/2)缩放相关的λ_0和λ_(±q),具有λ_0≠λ_(±q),用于螺旋顺序;这里{λ_(ky)}是纠缠Hatniltonian的L模式占用号码。 S_N中L中的术语(3/2)与S = 3螺旋顺序的非线性Sigma模型研究同意(Q =2π/ 3)。对于S_N和λ_(ky)的这些和obier属性用于数值针对螺旋相中变化的各向异性最近邻三角晶格模型。

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  • 来源
    《Physical review》 |2020年第19期|195124.1-195124.11|共11页
  • 作者单位

    Center for Quantum Spintronics Department of Physics Norwegian University of Science and Technology NO-7491 Trondheim Norway;

    Center for Quantum Spintronics Department of Physics Norwegian University of Science and Technology NO-7491 Trondheim Norway;

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