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. 2016 Jan 22;6:19624. doi: 10.1038/srep19624

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(a) Raman spectra of bulk and few-layer WTe₂. (b) Calculated phonon dispersion curve along the Γ-Y-X-Γ direction in the orthorhombic BZ, and DOS for the WTe₂ monolayer. Blue and green curves are optical and acoustic vibrational branches, respectively. (c) Calculated Raman spectrum for the WTe₂ monolayer. (d) Frequencies of the , , and modes as functions of the layer number.

Inline graphic — (a) Raman spectra of bulk and few-layer WTe₂. (b) Calculated phonon dispersion curve along the Γ-Y-X-Γ direction in the orthorhombic BZ, and DOS for the WTe₂ monolayer. Blue and green curves are optical and acoustic vibrational branches, respectively. (c) Calculated Raman spectrum for the WTe₂ monolayer. (d) Frequencies of the , , and modes as functions of the layer number.