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Uniaxial-Strain Control of Nematic Superconductivity in Sr<sub><i>x</i></sub>Bi<sub>2</sub>Se<sub>3</sub>

ORAL

Abstract

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 SrxBi2Se3, through externally-applied uniaxial stress [3]. The suppression of subdomains indicates that it is the Δ4y 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.

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Presenters

  • Yoshiteru Maeno

    Department of Physics, Kyoto University, Kyoto Univ., Kyoto University, Kyoto Univ, Department of Physics, Graduate School of Science, Kyoto University, Department of Physics, Kyoto University, Japan, Physics, Kyoto Univeristy, Physics, Kyoto University, Department of Physics, Graduate School of Science, Kyoto University, Japan

Authors

  • Ivan Kostylev

    Kyoto Univ.

  • Shingo Yonezawa

    Department of Physics, Kyoto University, Kyoto Univ., Physics, Kyoto University

  • Zhiwei Wang

    Univ. Cologne

  • Yoichi Ando

    Univ. Cologne, University of Cologne, Osaka University, Institute of Physics II, University of Cologne

  • Yoshiteru Maeno

    Department of Physics, Kyoto University, Kyoto Univ., Kyoto University, Kyoto Univ, Department of Physics, Graduate School of Science, Kyoto University, Department of Physics, Kyoto University, Japan, Physics, Kyoto Univeristy, Physics, Kyoto University, Department of Physics, Graduate School of Science, Kyoto University, Japan