Near-field infrared spectroscopy of monolayer MnPS3

Article

关键词: TRANSITION-METAL THIOPHOSPHATES;    2-DIMENSIONAL MATERIALS;    MPS3 M;    SPECTRA;    GRAPHENE;    DYNAMICS;    CRSITE3;    MODES;    BULK;    MN;   

DOI  :  10.1103/PhysRevB.100.075428

来源: SCIE

【 摘 要 】

We measured the near-field infrared response of MnPS3 in bulk, few-, and single-layer form and compared our findings with traditional far-field vibrational spectroscopies, a symmetry analysis, and first-principles lattice dynamics calculations. Trends in the B-u mode near 450 cm(-1) are striking, with the disappearance of this structure in the thinnest sheets. Combined with the amplified response of the activated A(g) mode and analysis of the A(u) + B-u features, we find that symmetry is unexpectedly increased in few- and single-sheet MnPS3 due to a restoration of the threefold axes of rotation. Monoclinicity in this system is therefore a consequence of the long-range stacking pattern and temperature rather than local structure.

【 授权许可】

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