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<p>Interlayer interactions in few-layer NiPS<sub>3</sub> were investigated by analyzing low-frequency interlayer vibration modes and Davydov splitting of an intralayer, A<sub>1g</sub> vibration mode at ~255 cm<sup>–1</sup> by Raman spectroscopy as a function of temperature. The interlayer force constants were estimated from the low-frequency Raman spectra by using the linear chain model. The out-of-plane direction interlayer force constant could also be estimated separately from the Davydov splitting, which agrees well with the linear chain model analysis. The dependence of the low-frequency shear and breathing modes and the Davydov splitting on the number of layers provide a unique, reliable tool for determining the number of layers.</p>

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Interlayer interaction and Davydov splitting in antiferromagnetic few-layer NiPS3

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月20日

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  • Manh Hong Nguyen,
  • Giung Park,
  • Je-Geun Park,
  • Hyeonsik Cheong

摘要

Interlayer interactions in few-layer NiPS3 were investigated by analyzing low-frequency interlayer vibration modes and Davydov splitting of an intralayer, A1g vibration mode at ~255 cm–1 by Raman spectroscopy as a function of temperature. The interlayer force constants were estimated from the low-frequency Raman spectra by using the linear chain model. The out-of-plane direction interlayer force constant could also be estimated separately from the Davydov splitting, which agrees well with the linear chain model analysis. The dependence of the low-frequency shear and breathing modes and the Davydov splitting on the number of layers provide a unique, reliable tool for determining the number of layers.