Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 90: Electronic structure of surfaces: Spectroscopy, surface states IV
O 90.3: Vortrag
Donnerstag, 15. März 2018, 11:00–11:15, MA 042
The nature of surface conductivity in samarium hexaboride — Peter Hlawenka1, Konrad Siemensmeyer1, Eugen Weschke1, Jaime Sánchez-Barriga1, Andrei Varykhalov1, Natalya Shitsevalova2, Slavomir Gabáni3, Karol Flachbart3, Oliver Rader1, and •Emile Rienks4,5 — 1Helmholtz-Zentrum Berlin, Berlin, Germany — 2National Academy of Sciences of Ukraine, Kiev, Ukraine — 3Slovak Academy of Sciences, Košice, Slovakia — 4Technische Universität Dresden, Dresden, Germany — 5IFW Dresden, Dreden, Germany
The prediction that Kondo insulators could be topologically non-trivial renewed interest in SmB6, a material that already earned a reputation as the first mixed valence system and Kondo insulator. Dzero et al.’s proposal [1] connects two of the most topical fields in solid state research: Topological insulators and strongly correlated materials. In addition, robust surface conductivity —inherent to a topological insulator— would elegantly explain SmB6’s anomalous transport properties. The notion that samarium hexaboride is a topological Kondo insulator is seemingly confirmed by recent experiments: It is found to be a surface-only conductor at low temperature and surface states have been found at the expected locations [2]. In this talk we will present crucial new insights from high-resolution angle-resolved photoemission spectroscopy [3] and discuss the implications.
[1] M. Dzero, et al., Phys. Rev. Lett., 104 (2010) 106408. [2] J. W. Allen, Phil. Mag. 96 (2016) 3227. [3] First results: P. Hlawenka et al., ArXiv: 1502.01542v1.