论文标题
在简单的金属有机框架模型中，平面带和非常规的超导性
Flat bands and unconventional superconductivity in a simple model of metal-organic frameworks
论文作者
论文摘要
超导金属有机框架Cu-bht形成一个kagome晶格，在键的顶点和配体处有金属。该双分基序在网状材料中很常见。我们表明，该晶格上的一个紧密结合模型在半填充时会部分占据干扰诱导的平坦带，它们与所有其他频段之间有较大的间隙。远距离跳跃会引起频带的曲率，但使它们比扭曲的双层石墨烯中的曲率更平坦，更孤立。该晶格上T -J模型的奴隶玻色子理论显示出高度非常规的超导性，包括F波单线阶段。因此，框架材料提供了一种理想的晶格驱动方法，用于在高电子密度下平坦带中强相关的现象。
The superconducting metal-organic framework Cu-BHT forms a kagome lattice with metals at the vertices and ligands along the bonds. This bipartite motif is common in reticular materials. We show that a tight-binding model on this lattice yields partially occupied interference-induced flat bands at half-filling with large gaps between them and all other bands. Long-range hopping induces curvature in the bands but leaves them flatter and more isolated than those in twisted bilayer graphene. The slave boson theory of the t-J model on this lattice shows highly unconventional superconductivity including an f -wave singlet phase. Thus, framework materials provide an ideal lattice-driven approach to strongly correlated phenomena in flat bands at high electronic densities.
