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Lecture 3 The Hamiltonian analysis of lattice vibrations.

WebThe acoustical branch is qualitatively similar to the dispersion relation for a monatomic lattice, but the optical branch represents a completely different form of wave motion. … WebWhat are optical and acoustical branches? The acoustic branch is that whose frequency becomes zero at k = 0 while the optical branch is that whose frequency has a finite value at k = 0. Is phonon a boson? Firstly, phonons are bosons, since any number of identical excitations can be created by repeated application of the creation operator ak ... heat generation in metal cutting

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