Fermion Condensates of massless $QED_2$ at Finite Density in non-trivial   Topological Sectors
  Vacuum expectation values of products of local bilinears $\bar\psi\psi$ are computed in massless $QED_2$ at finite density. It is shown that chiral condensates exhibit an oscillatory inhomogeneous behaviour depending on the chemical potential. The use of a path-integral approach clarifies the connection of this phenomenon with the topological structure of the theory. 
H.R. Christiansen and F.A. Schaposnik (Universidad Nacional de La   Plata, Argentina)