Stable Flatbands, Topology, and Superconductivity of Magic Honeycomb Networks
Jongjun M. Lee, Chenhua Geng, Jae Whan Park, Masaki Oshikawa, Sung-Sik Lee, Han Woong Yeom, Gil Young Cho
DOI 10.1103/PhysRevLett.124.137002 · Physical Review Letters
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Abstract
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−TaS2 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.
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