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arXiv 1102.3239cond-mat.str-el
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量子自旋系统中电子自旋共振的半经典方法

A semi-classical approach to electron spin resonance in quantum spin systems

Shunsuke C. Furuya, Masaki Oshikawa, Ian Affleck

摘要:

基于转子或非线性西格玛模型,我们发展了量子自旋系统中电子自旋共振的半经典近似。用分子动力学方法研究了经典时间演化,用经典Monte Carlo方法对随机初始条件进行采样。虽然这种近似在二维中可能特别有效,但我们在此将其应用于中等温度下,在交错和均匀磁场存在下的大自旋的一维系统。我们首先测试的半经典近似的有效性进行比较的磁化量子Monte Carlo结果S = 2链。然后,我们计算的ESR谱,发现广泛共存的顺磁和自旋波共振。

英文摘要:

We develop a semi-classical approximation to electron spin resonance in quantum spin systems, based on the rotor or non-linear sigma model. The classical time evolution is studied using molec- ular dynamics while random initial conditions are sampled using classical Monte Carlo methods. Although the approximation may be especially powerful in two dimensions, we apply it here to one- dimensional systems of large spin at intermediate temperatures, in the presence of staggered and uniform magnetic fields. We first test the validity of the semi-classical approximation by comparing the magnetization to quantum Monte Carlo results on S = 2 chains. Then we calculate the ESR spectrum, finding broad coexisting paramagnetic and spin wave resonances.

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