AVS 66th International Symposium & Exhibition
    2D Materials Tuesday Sessions
       Session 2D+AS+MI+NS-TuM

Paper 2D+AS+MI+NS-TuM1
Near-field Infrared Spectroscopy of Single Layer MnPS3

Tuesday, October 22, 2019, 8:00 am, Room A216

Session: 2D Materials Characterization including Microscopy and Spectroscopy
Presenter: Sabine Neal, University of Tennessee Knoxville
Authors: S.N. Neal, University of Tennessee Knoxville
H-S. Kim, Rutgers University
K.A. Smith, University of Tennessee Knoxville
A.V. Haglund, University of Tennessee Knoxville
D.G. Mandrus, University of Tennessee Knoxville
H.A. Bechtel, Advanced Light Source, Lawrence Berkeley National Laboratory
G.L. Carr, National Synchrtoron Light Source II, Brookhaven National Lab
K. Haule, Rutgers University
D. Vanderbilt, Rutgers University
J.L. Musfeldt, University of Tennessee Knoxville
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In order to explore the properties of a complex van der Waals material under confinement, we measured the near-field infrared response of the magnetic chalcogenide MnPS3 in bulk, few-, and single-layer form and compared the results with traditional far field vibrational spectroscopy and complementary lattice dynamics calculations. Trends in the activated Bu mode near 450 cm-1 are particularly striking, with the disappearance of this structure in the thinnest sheets. Combined with the amplified response of the Ag mode and analysis of the Au + Bu features, we find that the symmetry is unexpectedly increased in single-sheet MnPS3. The monoclinicity of this system is therefore a consequence of the long-range stacking pattern rather than local structure.