Manifestations of the Electron-Phonon Coupling in the Spectroscopy of High-Temperature Superconductors

Figure 12

(a) Spectral weight, (b) spin deviation (b), and (c) average kinetic energy of mediated by magnons near neighbor transitions for 𝑔₁=0 (diamonds) and 𝑔₁=0.5𝑔 (crosses). Other parameters are 𝐽/𝑡=0.4, 𝜔₀/𝑡=0.2, 𝑡^′=−0.5𝑡, 𝑡^′′=0.4𝑡, and 𝑁=4×4=16. Critical 𝜆_𝑐 is set at such coupling where the spectral weight of the ground state reaches 0.3 of the unrenormalized by EPI weight.

(a)

(b)

(c)