Band dispersions along the (Gamma-bar)-(M-bar) direction at k z = 0.28 c * obtained from the eight-band TB fit to DFT calculation. The red and blue lines represent spin-up and spin-down bands, respectively. The altermagnetic splitting within one band (Delta E 1 U ) and the splitting of opposite-spin bands closest to E F (Delta E 2 U ) at the U point are both defined.
