Illustration from Scientific Research

Two adjacent regions where the directions of inversion symmetry breaking are opposite. The spin textures are switched between the regions, leading to inverted spin-momentum locking; that is, for a given photoinduced spin, the momentum imbalance direction is inverted. When combined with spin scattering events (with scattering time ), this leads to spatial segregation of spins on femtosecond timescales and consequently the scattering-limited growth of negatively polarized domains (with polarization P ), which invert sign under inversion of the initial spin population.

DOI