Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 28: Transport: Topological insulators 2 (TT with HL/DS)
HL 28.6: Vortrag
Dienstag, 17. März 2015, 10:45–11:00, H 3005
SmO thin films: a flexible route to correlated flat bands with nontrivial topology — •Deepa Kasinathan1, Klaus Koepernik2, Liu Hao Tjeng1, and Maurits Haverkort1 — 1Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany — 2IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany
Using density functional theory based calculations, we show that the correlated mixed-valent compound SmO is a 3D strongly topological semi-metal as a result of a 4f-5d band inversion at the X point. We also show that the topological non-triviality in SmO is very robust and prevails for a wide range of lattice parameters, making it an ideal candidate to investigate topological nontrivial correlated flat bands in thin-film form. Moreover, the electron filling is tunable by strain. In addition, we find conditions for which the inversion is of the 4f-6s type, making SmO to be a rather unique system. The similarities of the crystal symmetry and the lattice constant of SmO to the well studied ferromagnetic semiconductor EuO, makes SmO/EuO thin film interfaces an excellent contender towards realizing the quantum anomalous Hall effect in a strongly correlated electron system.