1. Dec 24, 2014 #1

   Goodver

   

   Why momentum of phonons called quasimomentum? Is it due to the fact that wavenumber of vibrations confined in a first Brillouin zone, and therefore can not have an arbitrary value as "usual" momentum?

    

   Goodver, Dec 24, 2014
2. 
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3. Dec 25, 2014 #2

   DrDu

   

   Science Advisor

   The momentum of phonons isn't called quasimomentum. The true momentum of phonons is 0. While the true momentum is a consequence of translational invariance, quasi- or crystal-momentum is a consequence of the permutational symmetry of the atoms in the underlying crystal. See Ashcroft and Mermin, specifically one of the appendices.

    

   DrDu, Dec 25, 2014
4. Dec 30, 2014 #3

   gdpvk

   

   needed that info thanks
   Drdu will there be a gain in entropy of phonons , or heat from the movement of phonons

    

   gdpvk, Dec 30, 2014

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