Show, directly from the dispersion relation obtained in Section 4.2, that for every .…
PHYSICS · Subjective · Fermi University Physics · Condensed Matter, Materials & Soft Matter · Lattice dynamics and thermal properties of solids · Lattice dynamics and thermal properties of solids
Condensed Matter Physics, Ch Elastic waves and the vibrating chain
Problem
Show, directly from the dispersion relation ω2=(2K/M)(1−cosqa) obtained in Section 4.2, that ω(−q)=ω(q) for every q. Then say in one sentence what this symmetry means for the two travelling waves that meet at the zone boundary.