Spin density wave formation in graphene facilitated by the in-plane   magnetic field
  We suggest that by applying a magnetic field lying in the plane of graphene layer one may facilitate an excitonic condensation of electron-hole pairs with opposite spins and chiralities. The provided calculations yield a conservative estimate for the transition temperature $T_c \sim 0.1 B$. 
D. E. Kharzeev, S. A. Reyes and A. M. Tsvelik