The charge degrees of freedom in several different organic charge transfer salts display slow or glassy dynamics. To gain insight into this behavior, we obtain the low-energy theory for an extended dimer Hubbard model, considering the occupations of sites on neighboring dimers. We take a classical limit of the resulting effective model of coupled spins and dimers and study it using classical Monte Carlo simulations. We find that frustration induced by intradimer and interdimer interactions leads to glassiness in the charge degrees of freedom in the absence of ordering of the spin degrees of freedom. Our results may have relevance to experimental observations of relaxor ferroelectric behavior in the dynamics of organic charge transfer salts.

中文翻译：

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扩展二聚体 Hubbard 模型中的充电玻璃

几种不同有机电荷转移盐中的电荷自由度显示出缓慢或玻璃态的动力学。为了深入了解这种行为，我们获得了扩展二聚体哈伯德模型的低能理论，考虑到相邻二聚体上的位点占据。我们对耦合自旋和二聚体的有效模型进行经典限制，并使用经典的蒙特卡罗模拟对其进行研究。我们发现，在没有自旋自由度排序的情况下，由二聚体和中间二聚体相互作用引起的挫折会导致电荷自由度的玻璃化。我们的结果可能与有机电荷转移盐动力学中弛豫铁电行为的实验观察有关。