Strain engineering of Janus transition metal dichalcogenide nanotubes: an ab initio study Arpit Bhardwaj and Phanish Suryanarayana Eur. Phys. J. B, 95 3 (2022) 59 Published online: 25 March 2022 DOI: 10.1140/epjb/s10051-022-00319-8