Stable Flatbands, Topology, and Superconductivity of Magic Honeycomb Networks Academic Article uri icon

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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-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.

authors

  • Lee, Jongjun M
  • Geng, Chenhua
  • Park, Jae Whan
  • Oshikawa, Masaki
  • Lee, Sung-sik
  • Yeom, Han Woong
  • Cho, Gil Young

publication date

  • April 3, 2020