Ab initio study on the electromechanical response of Janus transition metal dihalide nanotubes Arpit Bhardwaj and Phanish Suryanarayana Eur. Phys. J. B, 96 3 (2023) 36 Published online: 22 March 2023 DOI: 10.1140/epjb/s10051-023-00507-0