ESM1: Movie of a longitudinal acoustic (LA) mode in MgB2 near to Γ.
The view is looking down the c-axis, small grey spheres are B atoms arranged in a hexagonal lattice while yellow spheres are represent Mg atoms.
ESM2: Movie of a transverse acoustic (TA) mode in MgB2 near to Γ. (see notes on ESM1).
Note the motion is transverse to the direction of correlation
ESM3: Movie of a longitudinal optic (LO) mode in MgB2 near to Γ. (see notes on ESM1).
Note the out-of-phase (anti-phase) motion of the atoms.
ESM4: Movie of a Transverse optic (TO) mode in MgB2 near to Γ. (see notes on ESM1).
Note the out-of-phase (anti-phase) motion of the atoms.
ESM5: Movie of the (low energy) LA mode near to Γ in CaAlSi.
The view is perpendicular to the c-axis, with the plane of Ca atoms (white) alternating with the Al-Si planes (blue and red, respectively). Note all motions are in phase.
ESM6: Movie of the (high energy) LO mode near to Γ in CaAlSi.
Same view and colors as for ESM5. Note the anti-phase motion of the adjacent Al and Si.
ESM7: Movie of the low energy mode near to zone boundary (0 0 0.5) in CaAlSi, which, by following the dispersion from Γ, is the acoustic mode.
Same view and colors as for ESM5. Note the anti-phase motion of the adjacent Al and Si.
ESM8: Movie of the high energy mode near to zone boundary (0 0 0.5) in CaAlSi, which, by following the dispersion from Γ, is the optic mode.
Same view and colors as for ESM5. Note the in-phase motion of the adjacent Al and Si.
ESM9: Movie of the low energy mode near to the anti-crossing at (0 0 0.21) in CaAlSi, which, by following the dispersion from Γ, is the acoustic mode.
Same view and colors as for ESM5. Note the polarization mixing.
ESM10: Movie of the high energy mode near to the anti-crossing at (0 0 0.21) in CaAlSi, which, by following the dispersion from Γ, is the optic mode.
Same view and colors as for ESM5. Note the polarization mixing.
ESM11: Movie of a Fe-As optical mode in PrFeAsO.
The lack of reflection symmetry about the Fe plane leads to elliptical atomic motions.
ESM12: Movie of one of the bond-stretching modes in YBa2Cu3O7 near to Γ.
Cu atoms are red, O white, Y yellow, Ba blue. The c-axis is vertical.
ESM13: Movie of one of the buckling modes in YBa2Cu3O7 near to Γ. (see notes on ESM12)
