Fig. 7: Mapping between Lieb lattice and diamond chain.
a Lieb lattice with a mid-length line of onsite impurity potentials ϵ at every other site (red dots) along the y-direction. All hopping terms are given by t. b Diamond chain obtained from Fourier transforming the lattice in (a) along the periodic y-direction, using the indicated supercell. The y-momentum ky becomes the equivalent of a flux per plaquette. The dashed hoppings pick up a positive ky phase in the clockwise direction within each plaquette.
