The supersingular locus of unitary Shimura varieties with exotic good   reduction
  In this paper, we use a group-theoretic approach to give a concrete description of the geometric structure of the supersingular locus of unitary Shimura varieties with exotic good reduction. This approach also is a more uniform way to prove results of this form obtained previously by, for example, Vollaard-Wedhorn and Rapoport-Terstiege-Wilson. 
Haifeng Wu
math.AG math.NT