Geometric chaoticity leads to ordered spectra for randomly interacting   fermions
  A rotationally invariant random interaction ensemble was realized in a single-j fermion model. The dominance of ground states with zero and maximum spin was confirmed and explained with a statistical approach based on the random coupling of individual angular momenta. The interpretation is supported by the structure of the ground state wave functions. 
D. Mulhall, A. Volya and V. Zelevinsky