Stable Flatbands, Topology, and Superconductivity of Magic Honeycomb Networks.,Physical Review Letters

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Stable Flatbands, Topology, and Superconductivity of Magic Honeycomb Networks.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-04-03 , DOI: 10.1103/physrevlett.124.137002
Jongjun M Lee ₁ , Chenhua Geng ₂ , Jae Whan Park ₃ , Masaki Oshikawa ₂ , Sung-Sik Lee _{4,

5} , Han Woong Yeom _{1,

3} , Gil Young Cho ₁

Affiliation

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.

中文翻译：

魔术蜂窝网络的稳定平带，拓扑和超导性。

基于一维网段的网络上层结构，我们提出了一种新的原理来实现在实际材料中坚固的扁平带。这种机制是在1T-TaS_ {2}与导电畴壁的蜂窝网络几乎相称的电荷密度波中自然实现的，由此产生的平坦带可以自然地解释增强的超导性。我们还表明，角状态是网络上层结构中出现的高阶拓扑绝缘子的标志。

更新日期：2020-04-01

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