title: Direct determination of the electron-phonon coupling matrix element in a correlated system.
abstract: High-resolution electron energy loss spectroscopy measurements have been carried out on an optimally doped cuprate Bi(2)Sr(2)CaCu(2)O(8+δ). The momentum-dependent energy and linewidth of an A1 optical phonon were obtained. Based on these data as well as detailed knowledge of the electronic structure, we developed a scheme to determine the electron-phonon coupling (EPC) matrix element related to a specific phonon mode. Such an approach is general and applicable to elucidating the full structure of EPC in a system with anisotropic electronic structure.
authors.affiliation: Beijing National Laboratory for Condensed-Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Huajun
authors.initials: H
authors.lastname: Qin
authors.forename: Junren
authors.initials: J
authors.lastname: Shi
authors.forename: Yanwei
authors.initials: Y
authors.lastname: Cao
authors.forename: Kehui
authors.initials: K
authors.lastname: Wu
authors.forename: Jiandi
authors.initials: J
authors.lastname: Zhang
authors.forename: E W
authors.initials: EW
authors.lastname: Plummer
authors.forename: J
authors.initials: J
authors.lastname: Wen
authors.forename: Z J
authors.initials: ZJ
authors.lastname: Xu
authors.forename: G D
authors.initials: GD
authors.lastname: Gu
authors.forename: Jiandong
authors.initials: J
authors.lastname: Guo