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Description:

The temperature evolution of the resonant Raman scattering from high-quality bilayer 2H-MoS2 encapsulated in hexagonal BN flakes is presented. The observed resonant Raman scattering spec- trum as initiated by the laser energy of 1.96 eV, close to the A excitonic resonance, shows rich and distinct vibrational features that are otherwise not observed in non-resonant scattering. The appear- ance of 1st and 2nd order phonon modes is unambiguously observed in a broad range of temperatures from 5 K to 320 K. The spectrum includes the Raman-active modes, i.e. E21g(Γ) and A1g(Γ) along with their Davydov-split counterparts, i.e. E1u(Γ) and B1u(Γ). The temperature evolution of the Raman scattering spectrum brings forward key observations, as the integrated intensity profiles of different phonon modes show diverse trends. The Raman-active A1g(Γ) mode, which dominates the Raman scattering spectrum at T=5 K quenches with increasing temperature. Surprisingly, at room temperature the B1u(Γ) mode, which is infrared-active in the bilayer, is substantially stronger than its nominally Raman-active A1g(Γ) counterpart.

Rights:

• cc-by-3.0
  

Keyword: Resonant Raman scattering, bilayer MoS2, temperature evolution

Date published: 2022-08-19

Publisher: Springer Science and Business Media LLC

Journal:

• Scientific Reports (ISSN: 20452322) 14169

Funding:

• Narodowym Centrum Nauki 2018/31/B/ST3/02111
• Narodowym Centrum Nauki 2017/27/B/ST3/00205
• Ministry of Education, Culture, Sports, Science and Technology JPMXP0112101001
• Japan Society for the Promotion of Science JP20H00354
• Core Research for Evolutional Science and Technology JPMJCR15F3

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1038/s41598-022-18439-7

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Updated at: 2025-05-21 08:30:07 +0900

Published on MDR: 2025-05-21 08:28:20 +0900