Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 82: Topological Insulators II (joint session TT/MA)

TT 82.5: Vortrag

Donnerstag, 15. März 2018, 10:30–10:45, A 053

Probing the topological nature of SmB₆ by dynamical mean field theory — Patrik Thunström^1,2 and •Karsten Held¹ — ¹Institute of Solid State Physics, TU Wien, 1040 Vienna, Austria — ²Department of Physics and Astronomy, Materials Theory, Uppsala University, 751 20 Uppsala, Sweden

Experiments on the presumptive topological insulator SmB₆ remain controversial and hotly debated, with largely conflicting physical interpretations. We present reliable density functional theory plus dynamical mean field theory calculations that yield a mixed valence (4f^5.5) state with a tiny bulk band gap and a Γ₁+Γ₈ ground state. The bulk states and the emerging topological surface states well agree with angular resolved photoemission spectra. Strong electronic correlations and the mixed valency severely modify the simple topological Kondo insulator picture, and explain, among others, the unusual spin texture of the topological surface states.