2026-05-24T16:35:42Z https://archive.materialscloud.org/oai2d

oai:materialscloud.org:aers2-k8x52 2026-04-30T14:44:27Z openaire_data community-mcarchive

van Waas, Thomas P. van Waas, Thomas P. Berthod, Christophe Berges, Jan Marzari, Nicola Dil, J. Hugo Poncé, Samuel 2026-03-05 <p>Angle-resolved photoemission spectroscopy is a powerful experimental technique for studying anisotropic many-body interactions through the electron spectral function. Existing attempts to decompose the spectral function into non-interacting dispersions and electron-phonon, electron-electron, and electron-impurity self-energies rely on linearization of the bands and manual assignment of self-energy magnitudes. Here, we show how self-energies can be extracted consistently for curved dispersions. We extend the maximum-entropy method to Eliashberg-function extraction with Bayesian inference, optimizing the parameters describing the dispersions and the magnitudes of electron-electron and electron-impurity interactions. We compare these novel methodologies with state-of-the-art approaches on model data, then demonstrate their applicability with two high-quality experimental data sets. With the first set, we identify the phonon modes of a two-dimensional electron liquid on TiO<sub>2</sub>-terminated SrTiO<sub>3</sub>. With the second set, we obtain unprecedented agreement between two Eliashberg functions of Li-doped graphene extracted from separate dispersions. We release these functionalities in the novel Python code xARPES.</p> <p>This submission contains all the files and scripts needed to generate the figures and tables of the \textsc{xARPES} paper.</p> application/zip application/zip text/markdown text/markdown https://doi.org/10.24435/materialscloud:2n-ap oai:materialscloud.org:aers2-k8x52 mcid:2026.56 eng Materials Cloud https://xarpes.readthedocs.io/en/latest/ https://arxiv.org/abs/2508.13845 https://pypi.org/project/xarpes/ https://anaconda.org/conda-forge/xarpes https://doi.org/10.1038/s41524-026-02026-9 https://archive.materialscloud.org/communities/mcarchive https://doi.org/10.24435/materialscloud:fz-qa info:eu-repo/semantics/openAccess GNU General Public License v3.0 or later https://www.gnu.org/licenses/gpl-3.0-standalone.html Eliashberg function Self-energy ARPES Maximum-entropy method Bayesian inference Photoemission kink Electron-phonon coupling Spectral function Fan-Migdal phonon modes Angle-resolved photoemission spectroscopy xARPES Extraction of the self energy and Eliashberg function from angle resolved photoemission spectroscopy using the \textsc{xARPES} code info:eu-repo/semantics/other