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TT: Fachverband Tiefe Temperaturen

TT 15: Focus Session: Spectroscopy of Quantum Spin Liquids

TT 15.4: Hauptvortrag

Montag, 7. März 2016, 16:45–17:15, H20

Three-dimensional Kitaev spin liquids — •Maria Hermanns, Kevin O'Brien, Achim Rosch, and Simon Trebst — Institute for Theoretical Physics, Cologne, Germany

The Kitaev honeycomb model has become one of the archetypal examples of topological phases of matter. Being one of the few highly frustrated spin models that are exactly solvable, it has shaped our understanding of quantum spin liquid phases in general.

In this talk, we discuss the rich physics arising in generalizations of the Kitaev model to three-dimensional lattice structures. These models have low-energy degrees of freedom that are Majorana fermions, and that in general form metallic states. Depending on the underlying lattice structure, these can be (almost) conventional metals with a Majorana Fermi surface or Dirac semi-metals, where the gapless modes form Fermi lines or even Weyl nodes. The resulting quantum spin liquids differ not only in their experimental signatures, but also in their response to perturbations, such as an external magnetic field or additional interactions.