Quasi-particle behavior of composite fermions in the half-filled Landau   level
  We calculate the effect of infrared fluctuations of the Chern-Simons gauge field on the single-particle Green's function of composite fermions in the half-filled Landau level via higher-dimensional bosonization on a curved Fermi surface. We find that composite fermions remain well-defined quasi-particles, with an effective mass given by the mean-field value, but with anomalously large damping and a spectral function that contains considerable weight away from the quasi-particle peak. 
Peter Kopietz (Goettingen) and Guillermo E. Castilla (UC Riverside)