PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Abstract
We investigate the evolution of both the occupied and unoccupied electronic structure in representative compounds
of the infinitely adaptive superlattice series (Sb2)m-Sb2Te3 (m = 0–3) by means of angle-resolved photoemission
spectroscopy and time-delayed two-photon photoemission, combined with first-principles band-structure
calculations. We discover that the topological nature of the surface states and their spin texture are robust, with
dispersions evolving from linear (Dirac-like) to parabolic (Rashba-like) along the series, as the materials evolve
from semiconductors to semimetals. Our findings provide a promising strategy for engineering the topological
states with the desired flexibility needed for realizing different quantum phenomena and spintronics applications.
