Through a Lattice Darkly: Shedding Light on Electron-Phonon Coupling in the High Tc Cuprates

Figure 9

(a) Fermi surface of the upper half of the first BZ. Diagonal lines indicate cuts used in Figure 8 while circles indicate the location in momentum space of the sign change crossover point for each of those cuts. These lie on a line indicated by the wavevector, and illustrated by the colored regions. (b) STM data independently determining this wavevector taken from [34]. (c) Cartoon illustrating how the charge ordering wavevector, , can open a gap at a binding energy where the electronic states are nestable. (d) Additional cartoon illustrating how the splitting, if slightly different in magnitude between the isotopes, can explain the observed sign change in the bands and its evolution as the dispersions intersect with .