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. 2015 Feb 17;5:8501. doi: 10.1038/srep08501

Figure 2. Phonon dispersion in the high symmetry directions for (a) black phosphorene and (b) blue phosphorene.

Figure 2

The slope of the longitudinal acoustic phonon branches at the Gamma point (shown as dashed straight lines), which represents the sound velocity, is anisotropic for black phosphorene and isotropic for blue phosphorene.