Controlling non-equilibrium CDW states in 1T-TaS$_{2}$ nano-thick crystals

ORAL

Abstract

Two-dimensional (2D) crystals provide an ideal platform for exotic electronic band structures in mono- or multi-layer forms. The thinning to nanoscale may also affect collective phenomena in interacting electron systems and can lead to unconventional states that are dramatically different from those in bulk. In this presentation, we report the systematic control of charge-density-wave (CDW) transitions by changing thickness and cooling rate in nano-thick crystals of 1T-type tantalum disulfide (1T-TaS$_{2}$). First, we discovered a new super-cooled nearly-commensurate CDW state, which shows metallic behavior at low temperatures. Furthermore, we achieved current-induced switching between various CDW states. The glassy behavior and non-linear response, possibly due to the reduced dimensionality, manifest the emergent complex nature of correlated electrons in 2D crystals with nanometer thickness.

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Authors

  • Masaro Yoshida

    • University of Tokyo
    • Univ. of Tokyo
    • Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Japan

  • Yijin Zhang

    • Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Japan

  • Ryuji Suzuki

    • Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Japan

  • Jianting Ye

    • Zernike Institute for Advanced Materials, University of Groningen, The Netherlands

  • Yoshihiro Iwasa

    • Quantum-Phase Electronics Center (QPEC) and Department of Applied Physics, The University of Tokyo, Japan