Electronic and structural properties of the phase transitions in TaTe<sub>2-x</sub>Se<sub>x</sub>

ORAL

Abstract

Charge density wave (CDW) is a spontaneous modulation of electron density, which is usually associated with periodic lattice distortion with the same wavelength. Such phenomenon is often observed in layered transition metal dichalcogenides (TMD), although its origin is still under debate. 1T-TMD TaTe2 shows a CDW like phase transition around 170 K where new modulation of 3×3 superstructure forms. Magnetic susceptibility and resistivity show abnormal behavior at the phase transition, which is inconsistent with conventional model or example. Here, we use combination of scanning tunneling microscopy/spectroscopy, low energy electron diffraction, and density functional theory calculations to study the temperature dependence of CDW in undoped and Se doped TaTe2 single crystals. We have observed a hidden phase with a distinct modulation, which can be stabilized by Se doping, and is less metallic than the 3×3 low temperature phase. Our results suggest a possible explanation to the mystery in transport properties, which provides new insight on the electron-lattice coupling associated with CDW phase transitions.

*NSF-DMREF-1629059

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Presenters

  • Chen Chen

    • Department of Physics and Astronomy, Rutgers University
    • Physics and Astronomy, Rutgers University, New Brunswick

Authors

  • Chen Chen

    • Department of Physics and Astronomy, Rutgers University
    • Physics and Astronomy, Rutgers University, New Brunswick

  • Heung Sik Kim

    • Rutgers University, New Brunswick
    • Department of Physics and Astronomy, Rutgers University

  • Alemayehu S Admasu

    • Department of Physics and Astronomy, Rutgers University

  • Wenhan Zhang

    • Department of Physics and Astronomy, Rutgers University
    • Physics and Astronomy, Rutgers University, New Brunswick

  • Fei-Ting Huang

    • Department of Physics and Astronomy, Rutgers University
    • Rutgers University, New Brunswick
    • Department of Physics and Astronomy, Rutgers University, New Jersey

  • Sang-Wook Cheong

    • Rutgers University
    • Department of Physics and Astronomy, Rutgers University
    • Rutgers University, New Brunswick
    • Rutgers Center for Emergent Materials and Department of Physics & Astronomy, Rutgers University
    • Center for Quantum Materials Synthesis and Department of Physics and Astronomy, Rutgers, the State University of New Jersey
    • Department of Physics, Rutgers University
    • Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University, Piscataway, NJ
    • Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
    • Physics, Rutgers University
    • Physics and Astronomy, Rutgers University, New Brunswick
    • Department of Physics and Astronomy, Rutgers University, New Jersey
    • Rutgers University, Physics and Astronomy, and Laboratory for Pohang Emergent Materials and Max Plank POSTECH Center for Complex Phase Materials, Pohang University of Science
    • RCEM, Department of Physics and Astronomy, Rutgers U.
    • Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Rutgers University
    • Department of Physics and Astronomy, 136 Frelinghuysen Road, Piscataway, New Jersey 08854, USA, Rutgers Center for Emergent Materials

  • Kristjan Haule

    • Rutgers University, New Brunswick
    • Physics and Astronomy, Rutgers University
    • Department of Physics and Astronomy, Rutgers University
    • Department of Physics, Rutgers University
    • Physics and Astronomy, Rutgers University, Piscataway, NJ, United States

  • David Vanderbilt

    • Rutgers University, New Brunswick
    • Department of Physics and Astronomy, Rutgers University
    • Department of Physics and Astronomy, Rutgers University, Piscataway, NJ-08854, USA
    • Physics and Astronomy, Rutgers University, New Brunswick
    • Department of Physics and Astronomy, Rutgers University, New Jersey
    • Rutgers University, USA
    • Rutgers Univ
    • Physics and Astronomy, Rutgers University, Piscataway, NJ, United States
    • Department of Physics and Astronomy, Rutgers University, Piscataway, NJ, USA

  • Weida Wu

    • Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
    • Department of Physics and Astronomy, Rutgers University
    • Physics and Astronomy, Rutgers University, New Brunswick
    • Rutgers University, New Brunswick