We report a novel approach for coherent multi-photon photoemission band mapping of the entire Brillouin zone with infrared light that is readily implemented in a laboratory setting. We excite a solid state material, Ag(110), with intense femtosecond laser pulses to excite higher-order multi-photon photoemission; angle-resolved electron spectroscopic acquisition records photoemission at large in-plane momenta involving optical transitions from the occupied to unoccupied bands of the sample that otherwise might remain hidden by the photoemission horizon. We propose this as a complementary ultrafast method to time- and angle-resolved two-color, e.g. infrared pump and extreme ultraviolet probe, photoemission spectroscopy, with the advantage of being able to measure and control the coherent electron dynamics.
@article{arxiv.2004.01620,
title = {Towards full surface Brillouin zone mapping by coherent multi-photon photoemission},
author = {Andi Li and Namitha Ann James and Tianyi Wang and Zehua Wang and Hrvoje Petek and Marcel Reutzel},
journal= {arXiv preprint arXiv:2004.01620},
year = {2020}
}