Finite Layer Thickness Stabilizes the Pfaffian State for the 5/2   Fractional Quantum Hall Effect: Wavefunction Overlap and Topological   Degeneracy
  We find the finite-width, i.e., the layer thickness, of experimental quasi-two dimensional systems produces a physical environment sufficient to stabilize the Moore-Read Pfaffian state thought to describe the fractional quantum Hall effect at filling factor $\nu=5/2$. This conclusion is based on exact calculations performed in the spherical and torus geometries, studying wavefunction overlap and ground state degeneracy 
Michael. R. Peterson, Th. Jolicoeur, and S. Das Sarma