Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1998-02-13
Phys.Rev.Lett. 81 (1998) 30-33
Physics
High Energy Physics
High Energy Physics - Theory
8 pages, no figure, to be published in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.81.30
We study dynamical symmetry breaking in three-dimensional QED with a Chern-Simons (CS) term, considering the screening effect of $N$ flavor fermions. We find a new phase of the vacuum, in which both the fermion mass and a magnetic field are dynamically generated, when the coefficient of the CS term $\kappa$ equals $N e^2/4 \pi$. The resultant vacuum becomes the finite-density state half-filled by fermions. For $\kappa=N e^2/2 \pi$, we find the fermion remains massless and only the magnetic field is induced. For $\kappa=0$, spontaneous magnetization does not occur and should be regarded as an external field.
Itoh Taichi
Kato Hiroshi
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