Exponents of the localization lengths in the bipartite Anderson model   with off-diagonal disorder
  We investigate the scaling properties of the two-dimensional (2D) Anderson model of localization with purely off-diagonal disorder (random hopping). In particular, we show that for small energies the infinite-size localization lengths as computed from transfer-matrix methods together with finite-size scaling diverge with a power-law behavior. The corresponding exponents seem to depend on the strength and the type of disorder chosen. 
Andrzej Eilmes, Rudolf A. Roemer, Michael Schreiber