Enhancement of Superconductivity in Monolayer NbSe<sub>2</sub>

ORAL

Abstract

The superconducting transition temperature of single unit cell FeSe on SrTiO3 (STO) heterostructure is known to be significantly enhanced over that of bulk FeSe, presumably due to a combination of the electron charge transfer from the STO substrate to FeSe and an enhanced electron-phonon interaction across the heterointerface. Here, we explored the possibility of similar physics in monolayer NbSe2 on n-type and p-type graphene substrates and found that the transition temperature is much higher in the latter heterostructures than in the former ones. The enhancement of superconductivity in monolayer NbSe2 on p-type graphene is likely a result of the charge transfer effect. We also studied the temperature dependence of the resistance of NbSe2 under an in-plane magnetic field. The extracted in-plane upper critical field of monolayer NbSe2 overcomes the Pauli paramagnetic limit, suggesting Ising pairing property. We will talk about the properties of monolayer NbSe2 films grown on other oxide substrates.

*This work is supported by the NSF-CAREER awards (DMR-1847811 and DMR-1453924), DOE (#DE-SC0019064), the Alfred P. Sloan Research Fellowship, and NSF 2DCC-MIP (DMR-1539916).

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Presenters

  • Hemian Yi

    • Pennsylvania State University

Authors

  • Hemian Yi

    • Pennsylvania State University

  • Timothy Pillsbury

    • Department of Physics, The Pennsylvania State University
    • Penn Sate University
    • Pennsylvania State University
    • Physics, Pennsylvania State University

  • Run Xiao

    • Pennsylvania State University
    • Department of Physics, The Pennsylvania State University
    • Physics, Pennsylvania State University
    • Department of Physics, Pennsylvania State University

  • Fei Wang

    • Pennsylvania State University
    • Department of Physics, The Pennsylvania State University
    • Department of Physics, Pennsylvania State University

  • Chengye Dong

    • Pennsylvania State University
    • Department of Materials Science and Engineering, The Pennsylvania State University

  • Yifan Zhao

    • Pennsylvania State University
    • Department of Physics, The Pennsylvania State University
    • Department of Physics, Pennsylvania State University

  • Guang Wang

    • Pennsylvania State University
    • Department of Physics, National University of Defense Technology
    • Department of Physics, Pennsylvania State University

  • lingjie zhou

    • Pennsylvania State University
    • Department of Physics, The Pennsylvania State University
    • Department of Physics, Pennsylvania State University

  • ling zhang

    • Pennsylvania State University
    • Department of Physics, Pennsylvania State University

  • JOSHUA ROBINSON

    • Pennsylvania State University

  • Moses Hung-Wai Chan

    • Pennsylvania State University
    • Department of Physics, Pennsylvania State University

  • Nitin Samarth

    • Penn Sate University
    • Pennsylvania State University
    • Department of Physics, The Pennsylvania State University
    • Department of Physics, Pennsylvania State University

  • Cui-Zu Chang

    • Pennsylvania State University
    • Department of Physics, The Pennsylvania State University
    • Department of Physics, Pennsylvania State University