Stable Flatbands, Topology, and Superconductivity of Magic Honeycomb Networks

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.

arXiv comment7+16 pages, 2+14 figures, Accepted version to PRL

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Cited by in corpus (17)

• Topological Materials Discovery from Crystal Symmetry
• Square-root higher-order topological insulator on a decorated honeycomb lattice
• Square-root topological semimetals
• Zoology of domain walls in quasi-2D correlated charge density wave of 1T-TaS2
• Electron-Phonon Interactions in Flat Band Systems
• Many-Body Invariants for Chern and Chiral Hinge Insulators
• Higher-Order Topological Insulator on a Martini Lattice and Its Square Root Descendant
• Non-Fermi Liquids in Conducting 2D Networks
• Flat-band solutions in $D$-dimensional decorated diamond and pyrochlore lattices: Reduction to molecular problem
• Optoelectronic Fingerprints of Interference between Different Charge Carriers in Graphene Superlattices and Analogies to Twisted Graphene Bilayers
• Line-graph-lattice crystal structures of stoichiometric materials
• Flat bands with fragile topology through superlattice engineering on single-layer graphene
• Orbital Edelstein effect of electronic itinerant orbital motion at edges
• Molecular dipoles in designer honeycomb lattices
• Emergent Quantum Phenomena of Noncentrosymmetric Charge-Density Wave in 1T-Transition Metal Dichalcogenides
• Robust Flat Bands with Tunable Energies in Honeycomb Superlattices
• Chiral electronic network within skyrmionic lattice on topological insulator surfaces