Dimensional Effect on the Lattice Anharmonicity in Graphene and Graphite
Source abstract
Abstract
ABSTRACT Dimensionality reduction is often expected to slow down the anharmonic decay of phonons since it drastically reduces the phase space for phonon‐phonon interactions. However, the anharmonic scattering behavior of the Raman‐active E 2g phonon in graphene deviates from this expectation when compared with graphite. Through systematic theoretical analysis, we reveal that this deviation arises from the dimensionality‐reduction‐induced enhancement of both phonon population and anharmonicity of flexural acoustic (also called ZA) phonons in graphene. This enhancement outweighs the reduced scattering phase space and results in a broader phonon linewidth. We further demonstrate that the anharmonicity of ZA phonons in graphite can be tuned by modifying the interlayer coupling. These results provide fundamental insight into lattice anharmonicity and highlight the critical role of dimensionality in the graphene‐graphite system.
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Research context
OpenAlex topics: Thermal properties of materials · Graphene research and applications · Boron and Carbon Nanomaterials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Eastern Institute for Advanced Study Eastern Institute of Technology Ningbo China
Department of Physics University of Science and Technology of China Hefei Anhui China
Advanced Interdisciplinary Science (AiR) Research Center Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo China
State Key Laboratory of Semiconductor Physics and Chip Technologies Institute of Semiconductors Chinese Academy of Sciences Beijing China
Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing China
Institute for Advanced Study Shenzhen University Shenzhen China
Funding
National Key Research and Development Program of China · National Natural Science Foundation of China
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