- #1

dRic2

Gold Member

- 832

- 209

- Summary:
- Where does the energy of a phonon go when it gets damped?

If you go beyond the harmonic approximation, phonons can not be thought as independent quasiparticles anymore and phonon-phonon interactions are taken into account. This eventually translates into the fact that phonons frequencies get renormalized ( ##\omega \rightarrow \omega^′ +i\nu ##) acquiring a

Now my, possibly trivial, question: if phonons represent lattice oscillations, and one phonon gets dumped... where does the energy carried by the oscillation go? Is it redistributed to the electronic structure? Or is it lost in heat generation?

Thanks,

Ric

*width*which gives a damped amplitude ##e^{-\nu t}## with a characteristic time ##\tau = 1/{\nu}##, like all quasi-particles.Now my, possibly trivial, question: if phonons represent lattice oscillations, and one phonon gets dumped... where does the energy carried by the oscillation go? Is it redistributed to the electronic structure? Or is it lost in heat generation?

Thanks,

Ric