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Intervalley scattering by acoustic phonons in two-dimensional MoS2 revealed by double-resonance Raman spectroscopy

Author

Listed:
  • Bruno R. Carvalho

    (Universidade Federal de Minas Gerais)

  • Yuanxi Wang

    (The Pennsylvania State University)

  • Sandro Mignuzzi

    (National Physical Laboratory
    King’s College London, Strand)

  • Debdulal Roy

    (National Physical Laboratory
    King’s College London, Strand)

  • Mauricio Terrones

    (The Pennsylvania State University
    The Pennsylvania State University
    The Pennsylvania State University)

  • Cristiano Fantini

    (Universidade Federal de Minas Gerais)

  • Vincent H. Crespi

    (The Pennsylvania State University)

  • Leandro M. Malard

    (Universidade Federal de Minas Gerais)

  • Marcos A. Pimenta

    (Universidade Federal de Minas Gerais)

Abstract

Double-resonance Raman scattering is a sensitive probe to study the electron-phonon scattering pathways in crystals. For semiconducting two-dimensional transition-metal dichalcogenides, the double-resonance Raman process involves different valleys and phonons in the Brillouin zone, and it has not yet been fully understood. Here we present a multiple energy excitation Raman study in conjunction with density functional theory calculations that unveil the double-resonance Raman scattering process in monolayer and bulk MoS2. Results show that the frequency of some Raman features shifts when changing the excitation energy, and first-principle simulations confirm that such bands arise from distinct acoustic phonons, connecting different valley states. The double-resonance Raman process is affected by the indirect-to-direct bandgap transition, and a comparison of results in monolayer and bulk allows the assignment of each Raman feature near the M or K points of the Brillouin zone. Our work highlights the underlying physics of intervalley scattering of electrons by acoustic phonons, which is essential for valley depolarization in MoS2.

Suggested Citation

  • Bruno R. Carvalho & Yuanxi Wang & Sandro Mignuzzi & Debdulal Roy & Mauricio Terrones & Cristiano Fantini & Vincent H. Crespi & Leandro M. Malard & Marcos A. Pimenta, 2017. "Intervalley scattering by acoustic phonons in two-dimensional MoS2 revealed by double-resonance Raman spectroscopy," Nature Communications, Nature, vol. 8(1), pages 1-8, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14670
    DOI: 10.1038/ncomms14670
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    Cited by:

    1. Qing-Hai Tan & Yun-Mei Li & Jia-Min Lai & Yu-Jia Sun & Zhe Zhang & Feilong Song & Cedric Robert & Xavier Marie & Weibo Gao & Ping-Heng Tan & Jun Zhang, 2023. "Quantum interference between dark-excitons and zone-edged acoustic phonons in few-layer WS2," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    2. Soungmin Bae & Kana Matsumoto & Hannes Raebiger & Ken-ichi Shudo & Yong-Hoon Kim & Ørjan Sele Handegård & Tadaaki Nagao & Masahiro Kitajima & Yuji Sakai & Xiang Zhang & Robert Vajtai & Pulickel Ajayan, 2022. "K-point longitudinal acoustic phonons are responsible for ultrafast intervalley scattering in monolayer MoSe2," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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