Helicity exchange and symmetry breaking of in-plane phonon scattering of h-BN probed by polarized Raman spectroscopy

Shih Po Chien, Yu Chen Chang, Kristan Bryan Simbulan, Shantanu Saha, Yu Fan Chiang, Rajendra K. Saroj, Gyu Chul Yi, Shamsul Arafin*, Ting Hua Lu*, Yann Wen Lan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Due to its atomic thickness and insulating nature, hexagonal boron nitride (h-BN) is considered to be one of the most promising substrates and gate insulating materials for two-dimensional electronic devices. In this study, polarized Raman spectroscopy was employed to uncover the effects of polarized incident light on the optical properties of h-BN phonon modes. Our measured polarization-resolved Raman spectra indicate that the symmetrical nature and the broken symmetry of degenerate phonon modes from h-BN are induced by linearly and elliptically polarized light, respectively. Moreover, a helicity exchange was observed between the excitation of circularly polarized light and the resulting opposite circular polarization of scattered light from h-BN. The measured phenomena were modeled on the basis of Raman tensors and Jones calculus to eventually calculate the amplitude coefficients of two orthogonal in-plane phonon modes. Hence, our experimental study provides a holistic understanding of the vibrational modes in h-BN, which is expected to enhance the knowledge of physical mechanisms such as heat capacity and thermal and electrical conductivities of this layered material.

Original languageEnglish
Article number182203
JournalApplied Physics Letters
Issue number18
Publication statusPublished - 2022 Oct 31

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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