New STM Tip-induced Phases in 1T-TaS$_2$

ORAL

Abstract

Transition metal dichalcogenide 1T-TaS$_2$ is a layered material featuring a unique set of charge density wave (CDW) phases. The close proximity of the CDW phases in energy makes the material prone to external perturbation, and the intricate electron-phonon and electron-electron interactions often lead to electronic/structural phase transitions in 1T-TaS$_2$. Here we report a new phase transition from the insulating commensurate CDW (also known as a Mott state) to a new metallic CDW state that is induced in 1T-TaS$_2$ by voltage pulses from an STM tip at low temperatures. We study the topographic and spectroscopic properties of the metallic CDW phase in detail with STM and Scanning Tunneling Spectroscopy (STS).

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Authors

  • Liguo Ma

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

  • Yijun Yu

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

  • Xiu Fang Lu

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

  • Ya Jun Yan

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

  • Y.H. Cho

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

  • Sang-Wook Cheong

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

  • Xian Hui 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