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. 2016 Jun 21;6:28024. doi: 10.1038/srep28024

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(a) Experimental Raman data of MoTe₂ under a 2.41 eV excitation, showing the evolution of the breathing mode peak position and intensity with layer number. The anti-Stokes intensity is anomalously greater than the Stokes intensity. (b) Illustration of the zone-center optical-phonon Raman scattering process.