Density Correlations of Magnetic Impurities and Disorder
  We consider an electron coupled to a random distribution of point vortices in the plane (magnetic impurities). We analyze the effect of the magnetic impurities on the density of states of the test particle, when the magnetic impurities have a spatial probability distribution governed by Bose or Fermi statistic at a given temperature. Comparison is made with the Poisson distribution, showing that the zero temperature Fermi distribution corresponds to less disorder. A phase diagram describing isolated impurities versus Landau level oscillations is proposed. 
Jean Desbois, Cyril Furtlehner and St\'ephane Ouvry (Division de   Physique Th\'eorique, IPN, Orsay)