Figure 2. The lower two bands from Fig. 2.2 in the Nambu-Gorkov convention (with parameters qµ = 4.5, zw = 1, mΨ = 1). (b): Energy spectrum for constant gauge field qA0 = qµ = 4.5 and linear fixed scalar profile φ(z) = z at η5 = 0.25 (zw = 1, mΨ = 1). The spectrum is gapped at the Fermi surface. We determine the Green’s function by spectral decomposition. For this we solve the Dirac eigenvalue problem in presence of both the (back- reacted) scalar and gauge field H(i→k, z)χ→k,n(z) = ω→k,nχ→k,n(z). (2.21)
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