PtBi₂ (Platinum Dibismuthide)

A layered van der Waals transition-metal pnictide that exists in several polymorphs, most notably a trigonal phase (space group P31m) that is non-centrosymmetric. It is a candidate type-I Weyl semimetal hosting topological surface Fermi arcs, exhibits giant and non-saturating magnetoresistance and ultrahigh carrier mobility, and shows superconductivity (including reports of surface superconductivity on its topological states). This rare coexistence of Weyl topology, extreme magnetotransport, and superconductivity makes PtBi₂ an important platform for studying topological semimetal physics and topological superconductivity.