%0 Journal Article
%A Vidal, R. C.
%A Bentmann, H.
%A Facio, J. I.
%A Heider, Tristan
%A Kagerer, P.
%A Fornari, C. I.
%A Peixoto, T. R. F.
%A Figgemeier, T.
%A Jung, S.
%A Cacho, C.
%A Büchner, B.
%A van den Brink, J.
%A Schneider, C. M.
%A Plucinski, L.
%A Schwier, E. F.
%A Shimada, K.
%A Richter, M.
%A Isaeva, A.
%A Reinert, F.
%T Orbital Complexity in Intrinsic Magnetic Topological Insulators MnBi 4 Te 7 and MnBi 6 Te 10
%J Physical review letters
%V 126
%N 17
%@ 0031-9007
%C College Park, Md.
%I APS
%M FZJ-2021-04764
%P 176403
%D 2021
%X Using angle-resolved photoelectron spectroscopy (ARPES), we investigate the surface electronic structure of the magnetic van der Waals compounds MnBi4Te7 and MnBi6Te10, the n=1 and 2 members of a modular (Bi2Te3)n(MnBi2Te4) series, which have attracted recent interest as intrinsic magnetic topological insulators. Combining circular dichroic, spin-resolved and photon-energy-dependent ARPES measurements with calculations based on density functional theory, we unveil complex momentum-dependent orbital and spin textures in the surface electronic structure and disentangle topological from trivial surface bands. We find that the Dirac-cone dispersion of the topologial surface state is strongly perturbed by hybridization with valence-band states for Bi2Te3-terminated surfaces but remains preserved for MnBi2Te4-terminated surfaces. Our results firmly establish the topologically nontrivial nature of these magnetic van der Waals materials and indicate that the possibility of realizing a quantized anomalous Hall conductivity depends on surface termination.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:33988442
%U <Go to ISI:>//WOS:000652836500011
%R 10.1103/PhysRevLett.126.176403
%U https://juser.fz-juelich.de/record/903035