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Recently, nematic superconductivity, in which the superconducting gap spontaneously lifts the rotational symmetry of the lattice, has been discovered [1]. In nematic superconductivity, multiple superconducting domains with different nematic orientations can exist. These domains can be controlled by a conjugate external stimulus, such as the stain induced by a uniaxial stress with a piezoelectric device [2]. Here, we report for the first time control of the nematic superconductivity and their domains of Sr_xBi₂Se₃, through externally-applied uniaxial stress [3]. The suppression of subdomains indicates that it is the Δ_4y state that is most favored under compression along the basal Bi-Bi bonds. These results provide an inevitable step towards microscopic understanding and future utilization of the unique topological nematic superconductivity.
[1] S. Yonezawa et al., Nat. Phys. 13, 123 (2017).
[2] I. Kostylev, S. Yonezawa, and Y. Maeno, J. Appl. Phys. 125, 082535 (2019).
[3] I. Kostylev et al., arXiv:1910.03252.