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Results tagged with phonons
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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.
4
votes
Accepted
How should I be thinking about phonons?
This is not the reason why we say that phonons carry quasimomentum instead of momentum. … of phonons. …
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1
vote
what is quasi-particle and its behaviour in solid?
When you have a great number of interacting particles (such as electrons in a solid), it becomes impossible to try to describe each electron individually. We introduce the concept of quasiparticle to …
- 2,489
5
votes
What do we know about the strength of the electron-phonon coupling in high-temperature super...
You are probably aware that the underlying mechanism responsible for superconductivity in cuprates or Fe-based superconductors is still subject to intense debate and research. The usual BCS electron-p …
- 2,489
1
vote
Problem with derivation of phonons in crystal
There is nothing wrong with looking for plane-wave like solutions of the form $A \exp (i (\omega t - k x) )$. Given the linearity of the equations, and as @ignacio pointed out the fact that the $\exp …
- 2,489
3
votes
Accepted
Are acoustic phonon frequencies always linear in $k$?
I think what they are trying to say is that in a lattice of ions, the waves propagate at the plasma frequency only if we can assume that the interaction between ions is sufficiently small (this assump …
- 2,489