Nature of excitations of the 5/2 fractional quantum Hall effect
  It is shown, with the help of exact diagonalization studies on systems with up to sixteen electrons, in the presence of up to two delta function impurities, that the Pfaffian model is inadequate for the actual quasiholes and quasiparticles of the 5/2 fractional quantum Hall effect. Implications for non-Abelian statistics are discussed. 
Csaba Toke, Nicolas Regnault, Jainendra K. Jain