Raman Spectroscopy of Atomically Thin MX$_{2}$ Materials

ORAL

Abstract

There has been growing interest in atomically thin layers of MX$_{2}$ materials, such as MoS$_{2}$, WS$_{2}$, MoSe$_{2}$, and WSe$_{2}$. Monolayers of these materials exhibit many physical properties distinctly different from those of bulk crystals, such as a direct rather than an indirect band gap, strong photoluminescence, and large exciton binding energies. Raman spectroscopy provides a powerful tool to characterize atomically thin 2D materials, having been utilized to probe the electron-phonon coupling and identify the layer thickness of MX$_{2}$ materials. To better understand Raman spectra, we perform systematic studies of Raman scattering in different MX$_{2}$ materials as a function of the photon excitation energy, light polarization, and spatial position. I will discuss their implications for quantitative characterization of MX$_{2}$ materials using Raman spectroscopy.

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Authors

  • Steven Drapcho

    • Dept. of Physics, University of California, Berkeley, CA 94720, USA

  • Jonghwan Kim

    • Dept. of Physics, University of California, Berkeley, CA 94720, USA

  • Xiaoping Hong

    • Dept. of Physics, University of California, Berkeley, CA 94720, USA

  • Chenhao Jin

    • Dept. of Physics, University of California, Berkeley, CA 94720, USA

  • Sufei Shi

    • Dept. of Physics, University of California, Berkeley, CA 94720, USA

  • Yu Zhang

    • Dept. of Mat. Science and Engineering, Peking University, Beijing 100871, China

  • Sefaattin Tongay

    • School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, USA

  • Jongmin Yuk

    • Dept. of Physics, University of California, Berkeley, CA 94720, USA

  • Alex Zettl

    • Dept. of Physics, University of California, Berkeley, CA 94720, USA

  • Junqiao Wu

    • Dept. of Mat. Science and Engineering, University of California, Berkeley, CA 94720, USA

  • Yanfeng Zhang

    • Dept. of Mat. Science and Engineering, Peking University, Beijing 100871, China

  • Feng Wang

    • Dept. of Physics, University of California, Berkeley, CA 94720, USA