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Results tagged with phonons
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user 3811
Collective excitations in periodic, elastic arrangements of atoms or molecules in condensed matter, like solids and some liquids. They are quasiparticle quantum modes of vibration of elastic structures of interacting particles.
3
votes
Phonon scattering process in raman spectroscopy
The vertical axis is energy and the horizontal axis is k-vector (crystal momentum).
$E_L$ is the energy of the incoming photon, not the phonon.
The vertical arrow on the left describes the process w …
- 16.9k
2
votes
Collective excitations: localized or delocalized?
Phonons are the same. … In reality, phonons, electrons, and other particles / quasiparticles / collective excitation may be anywhere from very localized to very delocalized. …
- 16.9k
6
votes
Why zero chemical potential does not allow the Bose-Einstein Condensation of Phonons?
For phonons, particle number is not conserved, and $\mu$ is always 0 (in equilibrium). Therefore, as T gets lower but $\mu$ stays the same, the occupation of every single mode goes down. …
- 16.9k
5
votes
Accepted
Why are sound waves associated with modes obeying linear dispersion relation?
Your question seems to have the premise: "The speed of sound is constant by definition, therefore, if high-frequency phonons move significantly faster or slower than low-frequency phonons, those high-frequency … phonons must not be sound waves". …
- 16.9k