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Lattice and Electronic Structural Evolutions in Compressed Multilayer MnPS3

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journal contribution
posted on 2023-08-21, 18:16 authored by Yalan Yan, Dengman Feng, Jian Zhu, Qiang Zhou, Fubo Tian, Fangfei Li, Danming Chao
MnPS3, a novel ternary-layered material, has attracted extensive attention in materials, physics, and chemistry owing to its excellent electrical transport and photoelectric properties. Pressure is a useful technique to explore unprecedented phenomena and properties in condensed matter. In this study, combining high-pressure Raman spectroscopy, high-pressure absorption spectroscopy measurements, and first-principles calculations, the pressure-induced lattice and electronic structural evolutions of multilayer MnPS3 were uncovered. A pressure-induced lifted symmetry (layer sliding) of multilayer MnPS3 from the C2/m-staggered P-dimer phase (phase I) to P3̅1m aligned P-dimer phase (phase II) at 6.7 GPa was demonstrated, evidenced by the overlap of Eg5 and A1g3 modes under high pressure and further first-principles calculations. Meanwhile, the linearly decreased optical band gap with pressure indicated that the charge-transfer excitations that define the gap were confined in intra-slab in nature regardless of the interlayer sliding. Further calculated band gap structure also suggested that no obvious electronic structural phase transition occurred in multilayer MnPS3 during the pressure-induced phase transition of multilayer MnPS3 except from a decreased band gap with pressure. In addition, both the results of absorption spectroscopy measurements and first-principles calculation demonstrated that multilayer MnPS3 remained to be a direct band gap semiconductor up to 21.8 GPa. Our findings are of great significance in expanding the application of compressive MnPS3 in photoelectric devices.

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