Effective action of a 2+1 dimensional system of nonrelativistic fermions   in the presence of a uniform magnetic field: dissipation effects
  The effective action of nonrelativistic fermions in 2+1 dimensions is analyzed at finite temperature and chemical potential in the presence of a uniform magnetic field perpendicular to the plane. The method used is a generalization of the derivative expansion technique. The induced Chern-Simons term is computed and shown to exhibit the Hall quantization. Effects of dissipation due to collisions are also analyzed. 
S. Sakhi