We review recent progress in the investigation of spin-resolved electronic states in emerging topological materials. Key advancements include the detection of out-of-plane spin components in warped Dirac-cone surface states (SS) of topological insulators (TIs), the characterization of unconventional Fermi-arc SS in topological semimetals, the identification of surface-selective Dirac-fermion mass in antiferromagnetic TIs, and the observation of unusual spin-polarized edge states in one-dimensional TIs. We also outline future prospects for spin-resolved ARPES enabled by state-of-the-art micro- and nano-focused ARPES beamlines at NanoTerasu.
Souma et al. (Thu,) studied this question.