1209.1292 (F. Akram et al.)

Vacuum Polarization and Dynamical Chiral Symmetry Breaking: Phase
Diagram of QED with Four-Fermion Contact Interaction
   [PDF]

F. Akram, A. Bashir, L. X. Gutierrez-Guerrero, B. Masud, J. Rodriguez-Quintero, C. Calcaneo-Roldan, M. E. Tejeda-Yeomans