Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 30: Ultra-cold atoms, ions, and BEC VII (joint session A/Q)
A 30.7: Talk
Friday, March 13, 2020, 12:45–13:00, f303
Bulk topological proximity effect in multilayer systems — Jaromir Panas1, •Bernhard Irsigler1, Jun-Hui Zheng1,2, and Walter Hofstetter1 — 1Goethe-University Frankfurt, Germany — 2NTNU, Trondheim, Norway
We investigate the bulk topological proximity effect in multilayer lattice systems. We show that one can introduce topological properties into a system composed of multiple trivial layers by coupling to a single nontrivial layer described by the Haldane model. This phenomenon depends not only on the number of layers but also on their arrangement, which can lead to the emergence of dark states in multilayer systems. The response of a trivial system to the proximity of a topological insulator appears to be highly nonlocal, in contrast to the proximity effect observed in context of superconductivity. We also find a range of parameters where our system is semimetallic with features similar to the ones observed in three-dimensional topological states. This is promising from the perspective of bridging two- and three-dimensional topologically protected states of matter.