Phys. Rev. Lett. 60, 2575–2578 (1988)Critical Behavior in (2+1)-Dimensional QEDReceived 7 April 1988; published in the issue dated 20 June 1988 QED in 2+1 dimensions, analyzed in the 1/N expansion, is shown to exhibit a critical behavior as the number N of fermions approaches 32/π2. The dynamical mass has a universal scaling behavior at the critical point. The existence of criticality is discovered first by an analytic study of the gap equation and the effective potential. Its existence and universality is then confirmed numerically. Similarities to four-dimensional theories are discussed. © 1988 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.60.2575
DOI:
10.1103/PhysRevLett.60.2575
PACS:
11.15.Pg, 11.15.Ex, 12.20.Ds
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