Tunable CDW and Superconductivity Phase Transitions in 1T-TaS$_2$ Thin Films through Gate-controlled Intercalation

ORAL

Abstract

1T-TaS$_2$ has a rich set of complex phases as a result of competition among multiple electronic orders in this layered material. The delicate balance among the various phases makes 1T-TaS$_2$ very sensitive to external modulations. Using PEO/LiClO$_4$ solid electrolyte as a medium between a gate electrode and the sample, we have successfully intercalated Li ions into 1T-TaS$_2$ thin flakes in a continuous and reversible way. This allows us to probe the interplay between CDW phases, Mott phase, and superconducting phase as the concentration of Lithium is varied. Apart from 1T-TaS$_2$, our method of controlled intercalation is a promising new technique which could be applied to other layered materials.

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Authors

  • Yijun Yu

    • State Key Laboratory of Surface Physics and Department of Physics, Fudan University

  • Fangyuan Yang

    • State Key Laboratory of Surface Physics and Department of Physics, Fudan University

  • Yajun Yan

    • Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China

  • YoungJai Choi

    • Rutgers Center for Emergent Materials, and Department of Physics and Astronomy, Rutgers University

  • Sejoong Kim

    • Korea Institute for Advanced Study, Seoul, Korea

  • Young-Woo Son

    • Korea Institute for Advanced Study, Seoul, Korea

  • Sang-Wook Cheong

    • Rutgers Center for Emergent Materials, and Department of Physics and Astronomy, Rutgers University

  • Xianhui Chen

    • Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China

  • Yuanbo Zhang

    • State Key Laboratory of Surface Physics and Department of Physics, Fudan University