Effects of Anisotropy in QED3 from Dyson-Schwinger equations in a box

Details Effects of Anisotropy in QED3 from Dyson-Schwinger equations in a box Effects of Anisotropy in QED3 from Dyson-Schwinger equations in a box

2011-03-08

arxiv.org/abs/1103.1578v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 7 figures, v2: minor changes, typos corrected, version accepted by PRB

Scientific paper

10.1103/PhysRevB.84.024520

We investigate the effect of anisotropies in the fermion velocities of 2+1 dimensional QED on the critical number N_f^c of fermions for dynamical mass generation. Our framework are the Dyson-Schwinger equations for the gauge boson and fermion propagators formulated in a finite volume. In contrast to previous Dyson-Schwinger studies we do not rely on an expansion in small anisotropies but keep the full velocity dependence of fermion equations intact. As result we find sizable variations of N_f^c away from the isotropic point in agreement with other approaches. We discuss the relevance of our findings for models of high-T_c superconductors.

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