  The Nambu - Jona-Lasinio model in 2+1 dimensions is simulated for non-zero
baryon chemical potential with a diquark source term. No evidence for a BCS
condensate or gap is seen at high density; rather, critical behaviour with
novel exponents is observed, suggesting that 2d superfluidity as first
described by Kosterlitz and Thouless is realised, but with the universality
class determined by the presence of relativistic fermions.
