Strain-induced spin vortex and Majorana Kramers pairs in doped topological insulators with nematic superconductivity

Using the Ginzburg-Landau approach, we show that strain of nematic superconductor can generate a specific (nematic) vorticity. In case doped topological insulators vorticity forms spin vortex. We find two types topologically different vortices either enhance (type I) or suppress II) superconductivity far from vortex core. apply Bogoliubov--de Gennes equations to study electronic states in with vortices. type I vortex, zero-energy are localized near These be identified as Majorana Kramers pairs. II there no states. Thus, establish nontrivial connection between and fermions superconductivity.