期刊
PHYSICAL REVIEW B
卷 103, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.035405
关键词
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资金
- National Science Foundation (NSF) EFRI-NewLAWprogram [1741693]
- Elemental Strategy Initiative by the MEXT, Japan [JPMXP0112101001]
- JSPS KAKENHI [JP20H00354]
- CREST, JST [JPMJCR15F3]
- National Science Foundation [ECCS-1943895]
- Emerging Frontiers & Multidisciplinary Activities
- Directorate For Engineering [1741693] Funding Source: National Science Foundation
By probing the interlayer interaction in layered honeycomb materials via chiral phonons, we found that the chirality of the Raman G mode decreases with increasing layer numbers. Our Raman tensor calculation results agree well with the experiments, indicating that the interlayer interaction can significantly influence lattice vibration.
van der Waals (vdW) interaction plays a significant role in controlling the physical properties of layered materials. Typically, the vdW interlayer interaction can be calculated by density functional theory or experimentally characterized by quantum capacitance measurement. Here, we report the probing of the interlayer interaction in layered honeycomb materials via chiral phonons. Through helicity resolved Raman measurements, we observed a reduced chirality of the Raman G mode with increasing layer numbers. We introduced interlayer coupling terms into the traditional Raman G mode tensor to simulate the reduced phonon chirality in Raman spectra. Our Raman tensor calculation results agree with the experiments well, suggesting that the interlayer interaction can significantly influence the lattice vibration. Our demonstration provides a perspective for characterizing the interlayer interactions in vdW layered materials with honeycomb lattice structure.
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