Computational Design of Flat-Band Material

a Pyrochlore lattice. The balls and sticks denote the sites and bonds, respectively. This is the A-site sublattice of A2B2O7 pyrochlore structure. b Band dispersion of the tight-binding model (Eq. 1) on the pyrochlore lattice. The parameters are set as ε =？？？0.2 and t？=？？？0.03. The unit of energy is eV. The number in (b) denotes the index of the irreducible representation, see ref. [34