Investigation of a CDDW Hamiltonian to Explore Possibility of Magneto-Quantum Oscillations in Electronic Specific Heat of Hole-Doped Cuprates

Figure 1

A few diagrams contributing to the self-energy. The wiggly lines carry momentum but no energy. The total momentum entering each impurity vertex, depicted by a slim ellipse, is zero. We have assumed that impurities are alike and distributed randomly. Whereas Figures 1(a) and 1(b) correspond to one impurity vertex, Figures 1(c) and 1(d) correspond to a product of four impurity potentials with nonzero averages. These are the cases where two impurities each gives rise to two potentials. Thus the figures involve the interference of the scattering by more than one impurity. We have assumed low concentration of impurities and therefore these figures yield smaller contributions compared to those corresponding to Figures1(a), 1(b), and the other diagrams of the same class involving only one impurity vertex.