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Nematic states are characterized by rotational symmetry breaking withouttranslational ordering. Recently, nematic superconductivity, in which thesuperconducting gap spontaneously lifts the rotational symmetry of the lattice,has been discovered. However the pairing mechanism and the mechanismdetermining the nematic orientation remain unresolved. A first step is todemonstrate control of the nematicity, through application of an externalsymmetry-breaking field, to determine the sign and strength of coupling to thelattice. Here, we report for the first time control of the nematic orientationof the superconductivity of Sr$_x$Bi$_2$Se$_3$, through externally-applieduniaxial stress. The suppression of subdomains indicates that it is the$\Delta_{4y}$ state that is most favoured under compression along the basalBi-Bi bonds. These results provide an inevitable step towards understanding themicroscopic origin of the unique topological nematic superconductivity.

Uniaxial-strain Control of Nematic Superconductivity in Sr$_{x}$Bi$_2$Se$_3$