TY  - GEN
A1  - Hlawenka, Peter
A1  - Siemensmeyer, Konrad
A1  - Weschke, Eugen
A1  - Varykhalov, Andrei
A1  - Sánchez-Barriga, Jaime
A1  - Shitsevalova, Natalya Y.
A1  - Dukhnenko, A.V.
A1  - Filipov, V. B.
A1  - Gabáni, Slavomir
A1  - Flachbart, Karol
A1  - Rader, Oliver
A1  - Rienks, Emile D. L.
T1  - Samarium hexaboride is a trivial surface conductor
T2  - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
N2  - SmB6 is predicted to be the first member of the intersection of topological insulators and Kondo insulators, strongly correlated materials in which the Fermi level lies in the gap of a many-body resonance that forms by hybridization between localized and itinerant states. While robust, surface-only conductivity at low temperature and the observation of surface states at the expected high symmetry points appear to confirm this prediction, we find both surface states at the (100) surface to be topologically trivial. We find the (Gamma) over bar state to appear Rashba split and explain the prominent (X) over bar state by a surface shift of the many-body resonance. We propose that the latter mechanism, which applies to several crystal terminations, can explain the unusual surface conductivity. While additional, as yet unobserved topological surface states cannot be excluded, our results show that a firm connection between the two material classes is still outstanding.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 612 
KW  - topological Kondo-insulator
KW  - SmB 6
KW  - photoemission
KW  - states
KW  - gap
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-424213
SN  - 1866-8372
IS  - 612
ER  - 
TY  - JOUR
A1  - Hlawenka, Peter
A1  - Siemensmeyer, Konrad
A1  - Weschke, Eugen
A1  - Varykhalov, Andrei
A1  - Sanchez-Barriga, Jaime
A1  - Shitsevalova, Natalya Y.
A1  - Dukhnenko, A. V.
A1  - Filipov, V. B.
A1  - Gabani, Slavomir
A1  - Flachbart, Karol
A1  - Rader, Oliver
A1  - Rienks, Emile D. L.
T1  - Samarium hexaboride is a trivial surface conductor
JF  - Nature Communications
N2  - SmB6 is predicted to be the first member of the intersection of topological insulators and Kondo insulators, strongly correlated materials in which the Fermi level lies in the gap of a many-body resonance that forms by hybridization between localized and itinerant states. While robust, surface-only conductivity at low temperature and the observation of surface states at the expected high symmetry points appear to confirm this prediction, we find both surface states at the (100) surface to be topologically trivial. We find the (Gamma) over bar state to appear Rashba split and explain the prominent (X) over bar state by a surface shift of the many-body resonance. We propose that the latter mechanism, which applies to several crystal terminations, can explain the unusual surface conductivity. While additional, as yet unobserved topological surface states cannot be excluded, our results show that a firm connection between the two material classes is still outstanding.
Y1  - 2018
U6  - https://doi.org/10.1038/s41467-018-02908-7
SN  - 2041-1723
VL  - 9
PB  - Nature Publ. Group
CY  - London
ER  -