Half-filled Landau level, topological insulator surfaces, and three-dimensional quantum spin liquids

The half-filled Landau level can support a plethora of exotic strongly correlated states. The authors interconnect a recently proposed Dirac particle theory of the half-filled Landau level with the physics of spin liquids and the surface states of topological insulators. Additionally, they suggest that composite fermions can be viewed as dipolar bound states of charge/vortex composites and show that their transport properties violate the conventional Wiedemann-Franz law.