Fig. 1: Pseudospin and spin in antiperovskites.
From: Robust weak antilocalization due to spin-orbital entanglement in Dirac material Sr3SnO
a Pseudospin-momentum locking induces a π phase shift for the two electron trajectories (antilocalization). Intervalley mixing causes weak localization for a system with spin-rotational symmetry. A Dirac system with strong spin–orbit coupling could give rise to antilocalization when valleys are mixed since spin-rotational symmetry is broken. b Antiperovskite structure of Sr3SnO. The anion (O) is surrounded by cations (Sr), unlike in normal perovskites, where anion and cation positions are exchanged. c Highly schematic diagram showing band inversion of Sr and Sn bands, which produces Dirac nodes along Γ–X momentum directions. d Two of the six Dirac pockets which form under moderate hole doping are shown. The arrows represent pseudospins consisting of wavefunctions originating mainly from Sn p states and Sr d states.
