Fig. 3: The electronic structures of Wannier Hamiltonian \({\hat{H}}_{0}\) and those with additional Sz symmetry \({\hat{H}}_{S}\).
From: Fragile topological band in the checkerboard antiferromagnetic monolayer FeSe

a Band structures of \({\hat{H}}_{S}\) (red dash line) and \({\hat{H}}_{0}\) (blue solid line). b Edge states of the \({\hat{H}}_{S}\) (red) and \({\hat{H}}_{0}\) (blue), with a surface onsite energy −0.1 eV. c, d The Wilson loop spectra of all occupied bands in \({\hat{H}}_{S}\) and \({\hat{H}}_{0}\), respectively.