Pairing and superconductivity in quasi-one-dimensional flat-band systems: Creutz and sawtooth lattices
Pairing and superconductivity in quasi-one-dimensional flat-band systems: Creutz and sawtooth lattices
We study the pairing and superconducting properties of the attractive Hubbard model in two quasi one-dimensional topological lattices: the Creutz and sawtooth lattices. They share two peculiar properties: each of their band structures exhibits a flat band with a non-trivial winding number. The difference, however, is that only the Creutz …