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.

*This work was supported by JSPS KAKENHI JP15H05851, JP15H05852, JP15H05853, JP15K21717, JP17H04848, and by the JSPS Core-to-Core program. The work at Cologne was funded by the DFG-Project number 277146847-CRC 1238 (Subproject A04).

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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