Symmetry breaking of in-plane Raman scattering by elliptically polarized light in MoS2

Teng De Huang, Kristan Bryan Simbulan, Yu Fan Chiang, Yann Wen Lan, Ting Hua Lu

Research output: Contribution to journalArticle

Abstract

The breaking of the doubly degenerate in-plane lattice vibrations in monolayer, bilayer, and bulk molybdenum disulfide (MoS2) are oftentimes ignored in the analysis of the material's lattice behaviors due to the lack of variation of polarization for the excitation light. In this work, we have observed variations in the relative intensity of the two most dominant Raman peaks of MoS2 via polarized micro-Raman spectroscopy using elliptically polarized incident light. The use of elliptically polarized light has demonstrated distinct properties in its incident Raman polarization vector. This gives an additional degree of freedom affecting the relationship between the x (E2gx1) and y (E2gy1) components of the material's in-plane lattice vibrations. The different ratio of the magnitudes for the E2gx1 and E2gy1 in the lattice vibrations can be induced by changing the polarization state of the incident light. This work investigates the material's unexplored fundamental phonon property that may enlighten past and future studies involving phonon behaviors.

Original languageEnglish
Article number195414
JournalPhysical Review B
Volume100
Issue number19
DOIs
Publication statusPublished - 2019 Nov 12
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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