Epitaxial growth of superconducting FeTe1-xSex film on a topological insulator

ORAL

Abstract

Integrating a superconductor (SC) and a topological insulator (TI) in a heterostructure via proximity effect is a promising approach for realizing topological superconductor. In particular, superconducting Fe(Te,Se) is one of the best candidates to create such a heterostructure with chalcogenide TIs. Nonetheless, stringent lattice-matching requirement of the Fe(Te,Se) films does not allow four-fold Fe(Te,Se) layer to grow properly on six-fold TI platform, although TI films can grow well on Fe(Te,Se) via van der Waals epitaxy. Here, surprisingly we discover that Fe(Te,Se) can grow epitaxially on a TI (Bi2Te3) layer with Tc as high as 13 K. Furthermore, this is the very first TI-SC heterostructure platform that can be formed in either of TI-on-SC or SC-on-TI sequence, opening a route to unprecedented topological heterostructures such as Weyl superconductors.

*This work is supported by the center for Quantum Materials Synthesis (cQMS), funded by the Gordon and Betty Moore Foundation's EPiQS initiative through Grant GBMF6402, and by Rutgers University. It is additionally supported by MURI W911NF2020166 and NSF DMR2004125.

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Presenters

  • Xiong Yao

    • Rutgers, The State University of New Jersey
    • Rutgers University, New Brunswick
    • Department of Physics & Astronomy, Rutgers, The State University of New Jersey

Authors

  • Xiong Yao

    • Rutgers, The State University of New Jersey
    • Rutgers University, New Brunswick
    • Department of Physics & Astronomy, Rutgers, The State University of New Jersey

  • Matthew Brahlek

    • Oak Ridge National Lab
    • Oak Ridge National Laboratory
    • Materials Science and Technology Division, Oak Ridge National Laboratory

  • Hee Taek Yi

    • Rutgers, The State University of New Jersey
    • Rutgers University, New Brunswick

  • Deepti Jain

    • Rutgers, The State University of New Jersey
    • Rutgers University, New Brunswick

  • Seongshik Oh

    • Rutgers University, New Brunswick
    • Department of Physics and Astronomy, Rutgers, The State University of New Jersey
    • Rutgers, The State University of New Jersey
    • Department of Physics & Astronomy, Rutgers, The State University of New Jersey