Dynamics of a Quantum Spin Liquid

This thesis presents an exact theoretical study of dynamical correlation functions in different phases of atwo-dimensional quantum spin liquid. By calculating the dynamical spin structure factor and the Raman scattering cross section, thisthesis shows that there are salient signatures-qualitative and quantitative-of the Majorana fermions and the gauge fluxes emerging as effective degrees of freedom in the exactly solvable Kitaev honeycomb lattice model. The model is a representative of a class of spin liquids with Majorana fermions coupled to Z2 gauge fields. The qualitative features of the response functions should therefore be characteristic for this broad class of topological states.