Zero-Temperature Dynamics of the S=1/2 Linear Heisenberg Antiferromagnet
Zero-Temperature Dynamics of the S=1/2 Linear Heisenberg Antiferromagnet
复制标题
S=1/2 线性海森堡反铁磁体的零温动力学
DOI：
10.1103/physrevlett.43.75
复制
发表时间：
1979
影响因子：
8.6
通讯作者：
J. Bonner
中科院分区：
文献类型：
--
作者：
G. Müller;H. Beck;J. Bonner
基于S=1.2线性海森堡反铁磁体的能谱由双自旋波激发所支配这一事实，给出了动力学自旋关联函数的解析表达式。我们的表达式不是精确的，但精确求和规则表明近似程度很小。我们预测，在均匀磁场中，谱权函数将呈现双峰结构。在最近的中子散射实验中观察到了这种特征。
We present an analytical expression for the dynamical spin-correlation function of the S= 1 2 linear Heisenberg antiferromagnet based on the fact that the spectrum is dominated by a double continuum of spin-wave excitations. Our expression is not exact, but exact sum rules show that the degree of approximation is small. We predict that in a uniform magnetic field the spectral weight function will display a double-peaked structure. Such a feature is observed in recent neutron-scattering experiments.