Electron-Phonon Interaction in Strongly Correlated Systems

Figure 13

Phonon dispersion curves (a) in the instability (0.28,0.86) direction and (b) in the (1,1) direction, for 𝑡=0.5 eV, 𝑡^′=−(1/6)𝑡, 𝑔=0.240/√2 eV, 𝜔₀=0.04 eV, and 𝑉_𝐶=0.55 eV. The solid curves correspond to the critical doping 𝛿_𝑐=0.195, the dot-dashed and the dotted curves correspond to 𝛿=0.21 and 𝛿=0.3, respectively.

(a)

(b)