1.

Schematic of the two successive pressure-driven topological phase transitions and the associated spin Berry curvature reconstruction. The upper panel shows the evolution of band inversion, surface states, and Fermi-level position across the topological insulator (TI), trivial insulator (NI), and high-pressure topological semimetal phases. The lower panel shows spin Berry curvature textures, highlighting a pronounced sign reversal in the two topological phases, in contrast to the trivial phase where this feature is strongly suppressed.