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Research Highlight

Angle- and Energy-Resolved Raman Scattering Enables Visualizing Electron-Phonon Coupling in Black Phosphorus

Scientific Achievement

Demonstrated direct evidence of electron-phonon coupling in black phosphorus that depends on both the spatial distribution of electrons and vibration patterns of phonons.

Significance and Impact

This work resolved controversies on the physical origin of Raman scattering in black phosphorus,  paving the way for manipulating the electron-phonon coupling in anisotropic nanomaterials for future device applications.

Research Details

- Raman measurements showed Raman signals of black phosphorus depended on laser polarization, excitation energy, and vibration patterns.

- First-principles calculations at CNMS corroborated experimental data and uncovered the mechanism of the intricate electron-phonon interactions.

N. Mao, X. Wang, Y. Lin, B. G. Sumpter, Q. Ji, T. Palacios, S. Huang, V. Meunier, M. S. Dresselhaus, W. A. Tisdale, L. Liang, X. Ling, and J. Kong, "Direct Observation of Symmetry-Dependent Electron-Probe Coupling in Black Phosphorus,"  J. Am. Chem. Soc. 141, 18994 (2019).   DOI: 10.1021/jacs.9b07974