Statistical Mechanics - B E Statistics : Landau Theory of Liquid Helium II - Phonons and Rotons
Phonons and rotons are elementary excitations which behave as Quasi Particles. As photons are the quantum of electromagnetic wave, phonons are the quantum of sound wave. Rotons play a crucial role in discussing the superfluid behavior of liquid helium. Phonons and Rotons both are bosons. A solid may be regarded as a gas of non interacting phonons, which is a spineless particle with definite energy and momentum.
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