Gap opening in monolayer FeSe/TiO<sub>2</sub>(100) at low doping

ORAL

Abstract

Monolayer FeSe grown on SrTiO3(001) has been established to host a high-temperature superconducting state, with the gap-opening temperature between 60 and 70 K. On the other hand, it was shown that monolayer FeSe exhibits an insulating gap when the electron doping level is below 0.09 electron per iron atom. This insulating gap is temperature independent, in contrast to the gap-opening phenomenology in superconducting monolayer FeSe. Here we grow monolayer FeSe on rutile TiO2(100), and show that the gap opens below 40 K with an electron doping of 0.08 electron per iron atom. This doping level is lower than the previously reported doping threshold for superconductivity. We will discuss the origin of this gap.

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Presenters

  • Chenhui Yan

    • Pritzker School of Molecular Engineering, University of Chicago
    • West Virginia University

Authors

  • Chenhui Yan

    • Pritzker School of Molecular Engineering, University of Chicago
    • West Virginia University

  • Brendan D. Faeth

    • Department of Physics, Laboratory of Atomic and Solid State Physics, Cornell University

  • Darrell Schlom

    • Cornell University
    • Department of Materials Science and Engineering, Cornell University
    • Department of Materials Science and Engineering, Kavli Institute at Cornell for Nanoscale Science, Cornell University
    • Materials Science and Engineering, Cornell University
    • Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14853, USA
    • Platform for the Accelerated Realization, Analysis, & Discovery of Interface Materials (PARADIM), Cornell University

  • Shuolong Yang

    • Pritzker School of Molecular Engineering, University of Chicago
    • University of Chicago

  • Kyle M Shen

    • Cornell University
    • Department of Physics, Cornell University, Cornell University
    • Department of Physics, Laboratory of Atomic and Solid State Physics, Cornell University
    • Laboratory of Atomic and Solid State Physics, Department of Physics, Kavli Institute at Cornell for Nanoscale Science, Cornell University