Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Phonon Dispersion

  1. Mar 16, 2012 #1
    I understand that the relationship between the phonon frequency and its wavenumber is the phonon dispersion. But is there a much more indepth definition of phonon dispersion and if i was asked to explain in a few lines (and in english not mathematical equations) what the phonon dispersion relation is, how would i go about it?
  2. jcsd
  3. Mar 16, 2012 #2
    It is the phonon energy (or frequency) as function of the wave vector (i.e. wavelength and direction of propagation) . For each wave vector there are several "branches" of phonons, i.e. modes with different energies. One distinguishes between "acoustic" phonons with E=0 at k=0 and optical phonons with E>0 at k=0.
  4. Mar 20, 2012 #3
    Thank you
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook