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VOLUME 55 (1992) | ISSUE 12 | PAGE 673
Dense (2+1)-dimensional QED in an external magnetic field
The effective action is derived for a QED2 + г with a nonzero chemical potential in an external magnetic field. The condition of electrical neutrality, dL /δμ = 0, has a set of solutions. When this condition holds, the minimum of the energy density Ε is reached at В #0.