A little note here: german: umklappen - to flip over When phonons leave the first Brillouin zone, they flip over and get back into it. Therefore it's called "flip-over" scattering or Umklapp-Streuung in german.
that doesnt make much sense, when the phonons hurt the rule of momentum conserved by the umlapp-process, why its not forbidden? where does the losing momentum goes?
A little note here:
german: umklappen - to flip over
When phonons leave the first Brillouin zone, they flip over and get back into it. Therefore it's called "flip-over" scattering or Umklapp-Streuung in german.
This topic is driving me crazy
How do phonons interact with photons? and how does the Raman spectra relate to the phononic band structure?
that doesnt make much sense, when the phonons hurt the rule of momentum conserved by the umlapp-process, why its not forbidden? where does the losing momentum goes?
Thanks, but expected more visual presentation instead of mysterious Gs and phonon-phonon words with no visual meaning behind
G=2pi/a reciprocal lattice vector