Johannsen, J. C.
Autès, G.
Crepaldi, A.
Moser, S.
Casarin, B.
Cilento, F.
Zacchigna, M.
Berger, H.
Magrez, A.
Bugnon, Ph.
Avila, J.
Asensio, M. C.
Parmigiani, F.
Yazyev, O. V.
Grioni, M.
Engineering the topological surface states in the (Sb2)m−Sb2Te3(m=0–3) superlattice serie
http://infoscience.epfl.ch/record/208048/files/PRB91_201101.pdf
http://infoscience.epfl.ch/record/208048/files/PRB91_201101_SM.pdf
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.
2015-05-28T22:56:05Z
http://infoscience.epfl.ch/record/208048