Reflection Positivity for Parafermions
  We establish reflection positivity for Gibbs trace states for a class of gauge-invariant, reflection-invariant Hamiltonians describing parafermion interactions on a lattice. We relate these results to recent work in the condensed-matter physics literature. 
Arthur Jaffe and Fabio L. Pedrocchi
quant-ph cond-mat.stat-mech math-ph math.MP