High-resolution electron energy loss spectroscopy measurements have been carried out on an optimally doped cuprate Bi2Sr2CaCu2O8+{\delta}. The momentum-dependent linewidth and the dispersion of an A1 optical phonon are obtained. Based on these data as well as the detailed knowledge of the electronic structure from angle-resolved photoemission spectroscopy, we develop a scheme to determine the full structure of electron-phonon coupling for a specific phonon mode, thus providing a general method for directly resolving the EPC matrix element in systems with anisotropic electronic structures.
@article{arxiv.1005.1452,
title = {Direct Determination of Electron-Phonon Coupling Matrix Element in a Correlated System},
author = {Huajun Qin and Junren Shi and Yanwei Cao and Kehui Wu and Jiandi Zhang and E. W. Plummer and J. Wen and Z. J. Xu and G. D. Gu and Jiandong Guo},
journal= {arXiv preprint arXiv:1005.1452},
year = {2015}
}