Fig. 2: Structural and vibrational properties of SnIP.
From: Degenerate topological line surface phonons in quasi-1D double helix crystal SnIP
a Crystal structure, b phonon dispersion and c Brillouin zone of SnIP. The orange region in the phonon dispersion highlighted in (b) corresponds to the topological features that we focus on. The phonon DOS is also shown in (b).
