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TT: Fachverband Tiefe Temperaturen
TT 51: Topological Insulators (joint session DS, HL, MA, O, TT, organized by MA)
TT 51.7: Vortrag
Mittwoch, 22. März 2017, 16:45–17:00, HSZ 401
Surfaces and interfaces of topological insulators from relativistic many-body calculations. — •Irene Aguilera, Christoph Friedrich, and Stefan Blügel — Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany.
We present a description of surfaces of topological insulators (TIs) as well as interfaces between different TIs and between TIs and trivial materials. We focus on materials of the Bi2Se3 family. We use the all-electron FLAPW formalism and the relativistic many-body GW method [1]. Including many-body effects in the calculation and incorporating the spin-orbit coupling into the self-energy are critical to obtain reliable results for these TIs [1-5]. For the description of surface and interface states, we use a basis of Wannier functions to construct the slabs and heterostructures Hamiltonians. This approach allows us to study very large systems with a high accuracy. We discuss the differences between surface and interface states and the interaction (“crosstalk”) between energetically non-degenerate Dirac cones at the interface and surfaces of the heterostructure.
[1] Aguilera et al., Phys. Rev. B 88, 165136 (2013). [2] Aguilera et al., Phys. Rev. B 91, 125129 (2015). [3] Aguilera et al., Phys. Rev. B 88, 045206 (2013). [4] Nechaev et al., Phys. Rev. B 87, 121111(R) (2013). [5] Michiardi et al., Phys. Rev. B 90, 075105 (2014).
Financial support from the Virtual Institute for Topological Insulators of the Helmholtz Association.
Correspondence: i.aguilera@fz-juelich.de