News and events
18 June 2019
Research seminar: Z2 vortex crystals in triangular antiferromagnets with strong spin orbit coupling
Presented By Ioannis Rousochatzakis (Loughborough)
- DAV.1.106 Sir David Davies
About this event
The triangular-lattice Heisenberg antiferromagnet is known to carry topological Z2 vortex excitations which form a gas at finite temperatures. In this seminar, we will discuss how the spin-orbit interaction can condense these vortices into a triangular Z2 vortex crystal at zero temperature. This is an example of a commensurate-incommensurate nucleation transition, analogous to the spontaneous formation of magnetic domains, Abrikosov vortices in type-II syperconductors, blue phases in cholesteric liquid crystals, and skyrmions in chiral helimagnets. As the mechanism relies on the interplay of geometric frustration and spin-orbital anisotropies, such vortex mesophases can materialize as a ground-state property in spin-orbit coupled correlated systems with hexagonal symmetry. I will also discuss how the vortices can be most saliently identified in experiment.