Fig. 2: Band dispersion of pentagonal lattice Hamiltonian with C4z symmetry.
From: Altermagnetism and strain induced altermagnetic transition in Cairo pentagonal monolayer
a The electronic band structure along the chosen k path in the first Brillouin zone. The parameters used are tm = 0.2, tnm,1 = 0.9, tnm,2 = 0.6, J = 1, ϵm = ϵnm = 0 and μ = 0. The spin up and spin down bands are shown in red and blue, respectively. b, c False color plots of the spin-splitting energy ΔEn(k) = En,↑(k) − En,↓(k) for the 4th and 5th pair of bands in the first Brillouin zone. Four dashed lines represent the spin-degenerate nodal lines that cross the Γ point.
