Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 87: Low-dimensional systems: Topological order 2 (TT with DS/HL/MA/O)
HL 87.11: Vortrag
Donnerstag, 19. März 2015, 17:45–18:00, H 3010
Angle-resolved Photoemission Investigation of SmB6 — •Peter Hlawenka1, Oliver Rader1, Konrad Siemensmeyer1, Eugen Weschke1, Andrei Varykhalov1, Natalya Shitsevalova2, Slavomir Gabani3, Karol Flachbart3, and Emile Rienks1 — 1Helmholtz-Zentrum Berlin — 2Institute for Problems of Material Science, Kiev — 3IEP, Slovak Academy of Science, Kosice
Recently the mixed valence compound SmB6 has drawn great attention. Theoretically predicted surface states, which should result from a hybridisation of localised f-bands with conduction electrons and a band inversion, would make SmB6 the first realisation of a so called topological Kondo insulator [1-2]. Conductivity and transport measurements, as well as spin-resolved photoemission spectroscopy seem to fortify the scenario of a topological nature of the conductive surface [3-5]. We investigate the surface electronic structure of SmB6 by means of high resolution angle-resolved photoemission spectroscopy measurements below 1 K. We will present new insights into the surface states that determine the low temperature conductivity of this material.
[1] Dzero et al., PRL 104, 106408 (2010).
[2] Lu et al., PRL 110, 096401 (2013).
[3] Wolgast, PRB 88, 180405 (2013).
[4] Kim, Sci. Rep. 3, 3150 (3013).
[5] Xu et al., Nat. Com. 5, 4566 (2014).