论文标题
相关跳跃在扁平体系的多体物理学中的作用：nagaoka铁磁性
The role of correlated hopping in many-body physics of flat-band systems: Nagaoka ferromagnetism
论文作者
论文摘要
在窄带系统中，对有效跳跃的相关贡献变得很重要，并且需要仔细考虑三种类型的跳跃过程：在双重占领的站点之间，在单一占领和空的地点之间，以及在双重占领的地点之间以及双重占用和空的或两个单一占领的地点之间。所有三个跳跃参数都不能同时消失，并且应该指定频段平坦的这些过程中的哪一个。通过有限系统的确切对角化，我们证明了三个跳跃在多体效应中扮演着质量不同的角色，尤其是在半金属铁磁（Nagaoka）状态的形成中。
In narrow-band systems, correlated contribution to effective hopping becomes important, and one needs to carefully consider three types of hopping processes: between doubly and singly occupied sites, between singly occupied and empty sites, and between doubly occupied and empty or two singly occupied sites. All three hopping parameters cannot vanish simultaneously, and one should specify for which of these processes the band becomes flat. By means of exact diagonalization of finite systems we demonstrate that three hoppings play qualitatively different roles in many-body effects, in particular, in the formation of half-metallic ferromagnetic (Nagaoka) states.
