Tailoring the properties of correlated oxides is accomplished by chemical doping, pressure, temperature or magnetic field. Photoexcitation is a valid alternative to reach out-of-equilibrium states otherwise inaccessible. Here, we quantitatively estimate the coupling between a lattice distortion and the charge-transfer excitation in (La2CuO4+δ). We photoinduce a coherent La ion vibration and monitor the response of the optical constants in a broad energy range, providing quantitative information on the electron-phonon matrix element that can be compared to theoretical models. We propose the same methodology to probe electron-electron interactions in other materials.
@article{arxiv.1504.02760,
title = {Probing the electron-phonon interaction in correlated systems with coherent lattice fluctuation spectroscopy},
author = {Andreas Mann and Edoardo Baldini and Antonio Tramontana and Ekaterina Pomjakushina and Kazimierz Conder and Christopher Arrell and Frank van Mourik and José Lorenzana and Fabrizio Carbone},
journal= {arXiv preprint arXiv:1504.02760},
year = {2015}
}