Occurrence of Non-Centrosymmetric Superconductivity by Tuning the Antisymmetric Spin-orbital Coupling in La(Pt<i><sub>x</sub></i>Si<sub>1-<i>x</i></sub>)<sub>2 </sub>Thin Films

ORAL

Abstract

The physical properties of solid compounds are governed by the symmetry of their crystal structure. In superconductors, an unconventional mixed-parity pairing which is neither spin singlet nor triplet state can emerge due to Fermi surface splitting caused by the absence of inversion symmetry. The complicated spin structure originating from mixed-parity pairing can cause topologically nontrivial surface or edge states in non-centrosymmetric superconductors. In this work, La(PtxSi1-x)2 thin films have been grown by systematically varying x from 0 to 0.68 by MBE technique. The superconductivity has been observed up to 2.60 K by transport measurement. The increasing concentration of Pt tends to suppress the transition temperature. Furthermore, incorporating Pt without changing the crystal structure can continuously tune the strength of the asymmetric spin-orbital coupling (ASOC) in La(PtxSi1-x)2 thin films, which thereby results in a non-centrosymmetric superconductor with multiple unconventional phases. Our work could facilitate the search for topologically nontrivial surface or edge states in non-centrosymmetric superconductors.

*National Science Foundation (NSF-DMR 1700137), Office of Naval Research (N00014-16-1-2657), and Center for Integrated Quantum Materials (DMR-1231319).

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Presenters

  • Yunbo Ou

    • Dept. Of Physics, Plasma Science and Fusion Center and Francis Bitter Magnet Lab, Massachusetts Institute of Technology
    • MIT
    • Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology
    • Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, MIT, Cambridge, MA, 02139

Authors

  • Yunbo Ou

    • Dept. Of Physics, Plasma Science and Fusion Center and Francis Bitter Magnet Lab, Massachusetts Institute of Technology
    • MIT
    • Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology
    • Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, MIT, Cambridge, MA, 02139

  • Jian Liao

    • Department of Physics, University of Texas at Dallas

  • Cigdem Ozsoy-Keskinbora

    • School of Engineering and Applied Sciences, Harvard University
    • Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University

  • Stephan Kraemer

    • Center for Nanoscale Systems, Harvard University

  • David Bell

    • Harvard University
    • School of Engineering and Applied Sciences, Harvard University
    • Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University

  • Xiaoyan Shi

    • Department of Physics, University of Texas at Dallas
    • Department of Physics, University of Texas at Dallas, Richardson, TX, 75080

  • Jagadeesh Moodera

    • Dept. Of Physics, Plasma Science and Fusion Center and Francis Bitter Magnet Lab, Massachusetts Institute of Technology
    • MIT
    • Department of Physics, Massachusetts Institute of Technology
    • Massachusetts Institute of Technology
    • Department of Physics, Plasma Science and Fusion Center, and Francis Bitter Magnet Lab, Massachusetts Institute of Technology
    • Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, MIT
    • Plasma Science and Fusion Center, and Francis Bitter Magnet Laboratory, and Department of Physics, MIT
    • Francis Bitter Magnet Laboratory and Plasma Science and Fusion Center, MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    • Plasma Science and Fusion Center and Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology
    • Physics, Francis Bitter Magnet Laboratory, Plasma Science and Fusion Center, Massachusetts Institute of Technology
    • Department of Physics, MIT, Cambridge, MA, 02139