arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0708.3773cond-mat.str-elcond-mat.stat-mech
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Gutzwiller波函数的精确密度矩阵:II。少数自旋分量

Exact density matrix of the Gutzwiller wave function: II. Minority spin component

Onuttom Narayan, Yoshio Kuramoto, Mitsuhiro Arikawa

摘要:

密度矩阵,即动量分布的傅里叶变换,是在一维中对Gutzwiller波函数的所有磁化进行解析得到的,排除了每个位置的双重占有。本文的结果补充了前人对多数自旋的密度矩阵的解析推导。推导利用平方波函数的行列式形式,并在粒子坐标上进行多重积分的帮助下的图形表示。在热力学极限下,距离x处的密度矩阵完全由量v_c x和v_s x表征,其中v_s和v_c是Gutzwiller波函数给出精确基态的超对称t-J模型中的自旋和电荷速度。本文的结果给出了零温下所有密度和磁化强度的t-J模型的精确密度矩阵。在动量分布的不连续性,斜率和曲率奇点被确定。通过数值傅里叶变换得到的动量分布与已有的结果吻合得很好。

英文摘要:

The density matrix, i.e. the Fourier transform of the momentum distribution, is obtained analytically for all magnetization of the Gutzwiller wave function in one dimension with exclusion of double occupancy per site. The present result complements the previous analytic derivation of the density matrix for the majority spin. The derivation makes use of a determinantal form of the squared wave function, and multiple integrals over particle coordinates are performed with the help of a diagrammatic representation. In the thermodynamic limit, the density matrix at distance x is completely characterized by quantities v_c x and v_s x, where v_s and v_c are spin and charge velocities in the supersymmetric t-J model for which the Gutzwiller wave function gives the exact ground state. The present result then gives the exact density matrix of the t-J model for all densities and all magnetization at zero temperature. Discontinuity, slope, and curvature singularities in the momentum distribution are identified. The momentum distribution obtained by numerical Fourier transform is in excellent agreement with existing result.

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