Exact exponents for the spin quantum Hall transition in the presence of   multiple edge channels
  Critical properties of quantum Hall systems are affected by the presence of extra edge channels - present, in particular, at higher plateau transitions. We study this phenomenon for the case of the spin quantum Hall transition. Using supersymmetry we map the corresponding network model to a classical loop model, whose boundary critical behavior was recently determined exactly. We verify predictions of the exact solution by extensive numerical simulations. 
Roberto Bondesan, Ilya A. Gruzberg, Jesper Lykke Jacobsen, Hideaki   Obuse, Hubert Saleur
cond-mat.mes-hall cond-mat.dis-nn