Figure 1. (IMAGE) Science China Press Caption The square lattice with three magnetic topological states. (a) The first Brillouin zone. (b) Schematic depiction of hourglass dispersion along Γ−X/Y and Γ−M high symmetry lines. (c) Schematic phase diagram with respect to the SOC parameters, where yellow, red and green regions represent topological semimetal, topologically trivial ferromagnetic semiconductor and QAHE states, respectively. Credit ©Science China Press Usage Restrictions Use with credit. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.