10.26204/DATA/14 Bernhart, Erik Erik Bernhart https://orcid.org/0000-0002-2268-0540 Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, Department of Physics and Research Center OPTIMAS Röhrle, Marvin Marvin Röhrle https://orcid.org/0000-0002-2257-1504 Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, Department of Physics and Research Center OPTIMAS Singh, Vijay Pal Vijay Pal Singh https://orcid.org/0000-0001-8881-978X Abu Dhabi University, Quantum Research Centre, Technology Innovation Institute Mathey, Ludwig Ludwig Mathey Universität Hamburg, Zentrum für Optische Quantentechnologien and Institut für Quantenphysik The Hamburg Centre for Ultrafast Imaging Amico, Luigi Luigi Amico Abu Dhabi University, Quantum Research Centre, Technology Innovation Institute University of Catania, Dipartimento di Fisica e Astronomia INFN-Sezione di Catania Ott, Herwig Herwig Ott https://orcid.org/0000-0002-3155-2719 Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, Department of Physics and Research Center OPTIMAS Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau 2025 2025 Creative Commons Attribution 4.0 International This repository contains the data for the article „Observation of Shapiro steps in an ultracold atomic Josephson junction“ by E. Bernhart, M. Röhrle, V. Singh, L. Mathey, L. Amico and H. Ott. The repo contains experimental and simulation data. The main experimental data, the current- chemical potential characteristics of the Shapiro drive for different modulation frequencies and modulation amplitudes are stored as csv-files. They csv table contain the barrier velocity and atomnumber imbalance which can be processed using the methods within the provided python evaluation scripts. They are generated by evaluating the main measurement signal, absorption images, as described in the article. The data of the main text are sorted by figures, all data of the supplementary are stored in one directory, more information about the data structure can be found in the read_me. The simulation data presented in the figures are also stored as csv files,or h5 images, and the source code, as well as the evaluation files are provided within this repo.