Lee Jongjun M, Geng Chenhua, Park Jae Whan, Oshikawa Masaki, Lee Sung-Sik, Yeom Han Woong, Cho Gil Young
Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
Phys Rev Lett. 2020 Apr 3;124(13):137002. doi: 10.1103/PhysRevLett.124.137002.
We propose a new principle to realize flatbands which are robust in real materials, based on a network superstructure of one-dimensional segments. This mechanism is naturally realized in the nearly commensurate charge-density wave of 1T-TaS_{2} with the honeycomb network of conducting domain walls, and the resulting flatband can naturally explain the enhanced superconductivity. We also show that corner states, which are a hallmark of the higher-order topological insulators, appear in the network superstructure.
我们提出了一种新原理，基于一维线段的网络超结构来实现真实材料中稳健的平带。这种机制在具有导电畴壁蜂窝网络的1T-TaS₂的近相称电荷密度波中自然实现，并且由此产生的平带能够自然地解释增强的超导性。我们还表明，作为高阶拓扑绝缘体标志的角态出现在该网络超结构中。
