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

Figure 4

Low-energy part of the spectral function of the hole at 𝐽/𝑡=0.3 and 𝜆=0.46 (a)–(d). The vertical arrows in (a)–(d) denote the position of the quasiparticle invisible in the scale of the figure because of low weight. (e) Dispersion of resonances at 𝐽/𝑡=0.3: broad resonance (circles) and the quasiparticle with small weight (squares) at 𝜆=0.46. The solid line is the dispersion of the hole (8) in the pure t-J model at 𝐽/𝑡=0.3 (𝑊_{𝐽/𝑡=0.3}=0.6) and 𝜀_min=−2.52. Panel (f) shows the potential of ground state 𝑄²/2 (solid line), potential of the excited state without the lattice relaxation (dashed line), and potential of the excited state after the lattice relaxation 𝐷+(𝑄−𝜆)²/2−𝜆²/2 (dotted line).