Fig. 1: Uniaxial-strain control of nematic superconductivity in Sr_xBi₂Se₃.

a Crystal structure of the mother compound Bi₂Se₃. The right figure shows the definitions of the axes and the field angle ϕ_ab with respect to the crystal structure in the ab plane, with three equivalent a and a* axes. b Photograph of the sample in the uniaxial strain cell with 4-wire terminal configuration. I and V labels next to the gold wires indicate the current and voltage leads, respectively. The large yellow arrows indicate the direction of the external strain, which was applied parallel to the x axis. c Magnetoresistance at specified field directions in the ab plane (ϕ_ab = 0°,  −30°,  −60°,  −90°), with and without Δε_xx. The data were obtained at 2.2 K and with 250 μA applied current. A substantial change in the magnetoresistance curves under large Δε_xx (green curves) provides evidence for the in-situ uniaxial-strain control of the nematic superconductivity. Source data are provided as a Source Data file.