Extended Data Fig. 1: Projected band structures of BP, BAs and SnSe.
From: Rashba valleys and quantum Hall states in few-layer black arsenic
a–c, Energy bands of ML BP (a), BAs (b) and SnSe (c). According to orbital analysis, the Γ valley consists of pz electrons, whereas along Γ–X, px orbitals dominate the TRS-paired D valleys. d–f, Projected band structures of bulk BP (d), BAs (e) and SnSe (f), which are consistent with the ML results. Note that SnSe has an extra set of py-symmetry valleys along the armchair direction17, which become merged with Γ valleys in BP and BAs11,16.
