期刊
PHYSICAL REVIEW B
卷 105, 期 12, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.105.125411
关键词
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资金
- National Natural Science Foundation of China [12072152, 11702132]
- National Key Research and Development Program of China [2019YFA0705400]
- Fundamental Research Funds for the Central Universities [NJ2020003, NZ2020001]
Using density-functional theory-calculated dielectric functions, the contribution of ionic polarizabilities to the van der Waals interactions of typical polar compounds was investigated. It was found that ionic polarizabilities contribute up to 3.4% of the dispersion energy between parallel half-spaces and up to 25% in parallel slabs separated distantly.
Ionic contributions to the van der Waals interactions of typical polar compounds have been investigated based on density-functional-theory-calculated dielectric functions. Derived from the Lifshitz theory, the contribution of ionic polarizabilities to the dispersion energy between parallel half-spaces can be up to 3.4%. Using the Clausius-Mossotti relationship with a Lorentz factor of 4 pi/3, it is found that the ionic effect on C-6 is consistent with that on energy. In parallel slabs separated distantly, the ionic polarizability plays a substantially enhanced role, contributing up to 25% of the energy. The significant ionic effect in the latter case is due to a reduction in the screening of low-frequency terms, and a zero Lorentz factor should be assumed to predict a consistent ionic effect on C-6.
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