An intrinsic peak-dip-hump and strong coupling effects in $B{i}_{2}S{r}_{2}CaC{u}_2{O}_{8+\delta }$ ARPES data near $(\pi ,0)$

Abstract

A well-known peak-dip-hump structure exists near $(\pi ,0)$ in superconducting state ARPES spectra of $B{i}_{2}S{r}_{2}CaC{u}_2{O}_{8+\delta }$ (Bi2212). Here we report results on optimal and overdoped Bi2212 samples indicating the traditional peak-dip-hump structure observed near $(\pi ,0)$ is largely due to bilayer splitting. However a separate, much weaker peak-dip hump (PDH) structure distinct from bilayer splitting can be detected near $(\pi ,0)$. This new PDH structure is consistent with electronic coupling to the magnetic resonance mode in Bi2212. Both the dispersion and line shape signatures indicate strong coupling to this mode.