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MA: Fachverband Magnetismus

MA 68: Poster 5

MA 68.16: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG4

Quantum phase diagram of a bilayer Kitaev model with interlayer Heisenberg interaction — •Julian Gritsch¹, Matthias Vojta², and Kai Phillip Schmidt¹ — ¹FAU Erlangen-Nürnberg, Erlangen, Germany — ²Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany

The Kitaev honeycomb model is an extensively studied two-dimensional quantum spin model exhibiting exotic spin-liquid phases. In this project, we study two layers of the Kitaev honeycomb model coupled by a Heisenberg interaction and we focus on the regime where the isolated Kitaev models would be in the topologically ordered Abelian phase. Consequently, as a function of the interlayer coupling, there must be at least one quantum phase transition separating the topologically ordered phase from the valence bond solid present at large interlayer Heisenberg coupling where the ground state is adiabatically connected to the limit of isolated singlets. In this work we study this quantum phase transition by investigating the elementary excitations of both quantum phases.