EXACT MULTIFRACTALITY FOR DISORDERED N-FLAVOR DIRAC FERMIONS IN 2 DIMENSIONS

We present a nonperturbative calculation of all multifractal scaling e xponents at strong disorder for critical wave functions of Dirac fermi ons interacting with a non-Abelian random vector potential in two dime nsions. The results, valid for an arbitrary number of fermionic flavor s, are obtained by deriving from conformal field theory an effective G aussian model for the wave function amplitudes and mapping it to the t hermodynamics of a single particle in a random potential. Our spectrum confirms that the wave functions remain delocalized in the presence o f strong disorder.