An intrinsic peak-dip-hump and strong coupling effects in $Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta}$ ARPES data near $(\pi,0)$

Author(s): Gromko, AD; Chuang, Y-D; Fedorov, AV; Aiura, Y; Yamaguchi, Y; Oka, K; Ando, Yoichi; Dessau, DS | Abstract: A well-known peak-dip-hump structure exists near $(\pi, 0)$ in superconducting state ARPES spectra of $Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta}$ (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.