University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Wednesday, September 18th 2019
1:25 pm:
Speaker: Gabor Halasz, ORNL
Subject:  Vison crystals in an extended Kitaev honeycomb model

We introduce an extension of the Kitaev honeycomb model by including four-spin interactions that preserve the local gauge structure and hence the integrability of the original model. The extended model has a rich phase diagram containing five distinct vison crystals, as well as a symmetric π-flux spin liquid with an approximate Fermi surface of Majorana fermions and a sequence of topological Lifshitz transitions. We discuss possible experimental signatures and, in particular, present finite-temperature Monte Carlo calculations of the specific heat and the static vison structure factor. We argue that our extended model emerges naturally from generic perturbations to the Kitaev honeycomb model.

Faculty Host: Natalia Perkins

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