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 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.
- Received 18 August 2019
- Revised 8 November 2019
- Accepted 6 March 2020
DOI:https://doi.org/10.1103/PhysRevLett.124.137002
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