Fig. 2: Dual topological bulk bands.
From: Dual topological states in the layered titanium-based oxypnictide superconductor BaTi2Sb2O
a Intensity plot along \(\bar{\Gamma }\)-\(\bar{M}\) direction with p-polarized 100 eV photons. Two bulk band (marked as TDBB and TIBB) near \(\bar{\Gamma }\) point are dominated. b Intensity plot of kz dependent ARPES data (i) and corresponding bulk calculated result (ii) along Γ-M direction with p-polarized photons at EF - 0.5 eV, which indicate the kz dispersion of TIBB. c ARPES intensity plot along \(\bar{\Gamma }\)-\(\bar{M}\) direction at different kz indicated by black dashed lines marked as Cut 1 to 4 in (b) with hν = 94, 96, 98 and 100 eV p-polarized photons. d Second derivative plot of (c). e Schematic of projected two Dirac cone from TDS and TI into the (km, kz, E) space.
