论文标题
呼吸量晶格上的群集莫特绝缘子之间的聚类过渡
Clusterization transition between cluster Mott insulators on a breathing Kagomé lattice
论文作者
论文摘要
在各种群集莫特绝缘子上的最新实验进展中，我们研究了带有单个电子轨道和$ 1/6 $电子填充的呼吸kagomé晶格上的扩展哈伯德模型。由于相邻位点之间存在电子排斥，而不是从常规的莫特绝缘子中的现场哈伯德相互作用中，在群集莫特制度中发现了两种不同类型的簇定位。我们引入了一个统一的Parton施工框架，以适应两种类型的群集绝缘阶段以及微不足道的Ferm液体金属，并讨论相图中的相变。结果表明，在群集定位阶段之一中，强烈的现场排斥在呼吸kagomé晶格上的两个三角形簇之一中导致局部金属行为。我们进一步评论了与现有基于MO的集群磁铁的实验相关性。
Motivated by recent experimental progress on various cluster Mott insulators, we study an extended Hubbard model on a breathing Kagomé lattice with a single electron orbital and $1/6$ electron filling. Two distinct types of cluster localization are found in the cluster Mott regime due to the presence of the electron repulsion between neighboring sites, rather than from the on-site Hubbard interaction in the conventional Mott insulators. We introduce a unified parton construction framework to accommodate both type of cluster Mott insulating phase as well as a trivial Ferm liquid metal and discuss the phase transitions in the phase diagram. It is shown that, in one of the cluster localization phases, the strong inter-site repulsion results into locally metallic behavior within one of two triangular clusters on the breathing Kagomé lattice. We further comment on experimental relevance to existing Mo-based cluster magnets.
