TY  - JOUR
AU  - Vidal, R. C.
AU  - Bentmann, H.
AU  - Facio, J. I.
AU  - Heider, Tristan
AU  - Kagerer, P.
AU  - Fornari, C. I.
AU  - Peixoto, T. R. F.
AU  - Figgemeier, T.
AU  - Jung, S.
AU  - Cacho, C.
AU  - Büchner, B.
AU  - van den Brink, J.
AU  - Schneider, C. M.
AU  - Plucinski, L.
AU  - Schwier, E. F.
AU  - Shimada, K.
AU  - Richter, M.
AU  - Isaeva, A.
AU  - Reinert, F.
TI  - Orbital Complexity in Intrinsic Magnetic Topological Insulators MnBi 4 Te 7 and MnBi 6 Te 10
JO  - Physical review letters
VL  - 126
IS  - 17
SN  - 0031-9007
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2021-04764
SP  - 176403
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:33988442
UR  - <Go to ISI:>//WOS:000652836500011
DO  - DOI:10.1103/PhysRevLett.126.176403
UR  - https://juser.fz-juelich.de/record/903035
ER  -