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Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 50: Poster Session: Correlated Electrons 2

TT 50.3: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

Chiral spin liquid phase in a generalized Kitaev model — •Tim Eschmann, Vatsal Dwivedi, Ciarán Hickey, and Simon Trebst — Institute for Theoretical Physics, University of Cologne, Germany

In the field of frustrated magnets, chiral spin liquids are of particular interest for their realization of fractional quantum Hall physics in quantum lattice systems. In this poster, we will discuss the formation of a chiral spin liquid in a generalized Kitaev model on the Shastry-Sutherland lattice. Similar to the original solution for the Kitaev honeycomb model, this five-coordinated lattice allows for an exact solution where the original spin degrees of freedom fractionalize into Majorana fermions and a Z2 gauge field. Varying the coupling strengths one finds a variety of spin liquid phases, the most interesting one being a spin analog of a second-order topological insulator. Using large-scale sign-problem free quantum Monte Carlo simulations, we identify the thermodynamic signatures of these phases and show that the ordering of the Z2 gauge field occurs at a particularly high transition temperature.

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