Two-dimensional Dirac fermions with random axial-vector potential
  A Dirac fermion model with random axial-vector potential is proposed. At a special strength of randomness, the symmetry of the action is enhanced, which is due to the gauge symmetry \`a la Nishimori. Some exact scaling exponents of single-particle Green functions are computed. The relationship with the XY gauge glass model is discussed. 
T. Fukui, H. Emura, and H. Yamada