Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 18: f-Electron Systems and Heavy Fermions II
TT 18.6: Talk
Monday, March 12, 2018, 16:15–16:30, H 3005
3D topological Kondo insulators: surface band structure and space charge screening — •soroush arabi1, francisco meirinhos1, and johann kroha1,2 — 1Physikalisches Institut and Bethe Center for Theoretical Physics, Universität Bonn, Germany — 2Center for Correlated Matter, Zhejiang University, Hangzhou, Zhejiang 310058, China
Topological Kondo insulators (TKIs) are a new class of topological insulators, emerging through the interplay of strong correlations and spin-orbit coupling. In TKIs, the bulk is a narrow band insulator due to the appearance of a localised Kondo resonance near the Fermi level and its hybridisation with the conduction band. Additionally, the strong spin-orbit coupling of the localised moments generates a nonlocal hybridisation between the local moments and the conduction band, which results in a topologically nontrivial band structure and gapless surface states [1]. In this work, we study TKIs in a slab geometry and address the problems of space charges and screening near the surfaces. The strong Kondo correlations in the 4f orbitals are treated by a layer-dependent slave boson mean field (SBMF) theory, while the Coulomb repulsion in the conduction band is described by Hartree-Fock (HF) approximation. We solve the coupled SBMF+HF theory self-consistently and thereby analyse the perseverance of topological surface states.