Raman Forbidden Layer-Breathing Modes in Layered Semiconductor Materials Activated by Phonon and Optical Cavity Effects
We report Raman forbidden layer-breathing modes (LBMs) in layered semiconductor materials (LSMs). The intensity distribution of all observed LBMs depends on layer number, incident light wavelength, and refractive index mismatch between LSM and underlying substrate. These results are understood by a Raman scattering theory via the proposed spatial interference model, where the naturally occurring optical and phonon cavities in LSMs enable spatially coherent photon-phonon coupling mediated by the corresponding one-dimensional periodic electronic states. Our work reveals the impact of spatial coherence of photon and phonon fields on phonon excitation via photon or phonon cavity engineering.
Authors
- Xue‐Lu Liu (ORCID: https://orcid.org/0000-0001-9156-6760)
- Ping‐Heng Tan (ORCID: https://orcid.org/0000-0001-6575-1516)
- Jiangbin Wu (ORCID: https://orcid.org/0000-0002-8751-7082)
- Miao‐Ling Lin (ORCID: https://orcid.org/0000-0001-5838-8237)
- Jun‐Wei Luo (ORCID: https://orcid.org/0000-0002-1147-8267)
- Tao Liu (ORCID: https://orcid.org/0000-0003-2353-1819)
- Rui Mei (ORCID: https://orcid.org/0000-0001-7480-2004)
- Heng Wu (ORCID: https://orcid.org/0000-0002-2582-6322)
- Lin‐Wang Wang (ORCID: https://orcid.org/0000-0001-7061-2692)
- Shan Guan (ORCID: https://orcid.org/0000-0003-0367-736X)
- Jia-Liang Xie (ORCID: https://orcid.org/0009-0009-1154-8614)
- AC Ferrari
Institutions
- Chinese Academy of Sciences (CN)
- University of Cambridge (GB)
- Institute of Semiconductors (CN)
- University of Chinese Academy of Sciences (CN)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-03-07
- DOI
- https://doi.org/10.1103/physrevlett.134.096903
- Citations
- 6
- Primary Topic
- 2D Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 3.11
Funders
- European Commission
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
- Engineering and Physical Sciences Research Council
- European Research Council
- Beijing Nova Program
- National Key Research and Development Program of China
- Key Research Program of Frontier Science, Chinese Academy of Sciences