论文标题
强烈相关的自旋跨界系统中的激子有序：诱导磁性和激发频谱
Excitonic ordering in strongly correlated spin crossover systems: induced magnetism and excitonic excitation spectrum
论文作者
论文摘要
在有效的汉密尔顿式卡纳莫里（Kanamori）模型的有效汉密尔顿（Hamiltonian）的框架内考虑了与激子的原子间跳和激发型玻璃凝结系统相关的作用。即使在没有原子质交换相互作用的情况下，也发现了由于激子秩序引起的抗铁磁秩序的出现。激发激发的光谱是在“温度与晶体场”相图的各个点上计算的。在激子排序区域之外，频谱有一个间隙，在激子冷凝水相的边界上消失了。在布里鲁因区域上发现了不均匀的光谱重量分布。也讨论了电子 - 音波相互作用的作用。
The effects associated with interatomic hoppings of excitons and the excitonic Bose condensate formation in the strongly correlated spin crossover systems are considered in the framework of the effective Hamiltonian for the two-band Kanamori model. The appearance of antiferromagnetic ordering due to the exciton order is found even in the absence of interatomic exchange interaction. The spectrum of excitonic excitations is calculated at various points of the "temperature vs. crystal field" phase diagram. Outside the region of exciton ordering, the spectrum has a gap, which vanishes at the boundary of the exciton condensate phase. The non-uniform spectral weight distribution over the Brillouin zone is found. The role of electron-phonon interaction is discussed as well.
