phonon-phonon interaction

[luca.montana]

Dear Developers,

can you tell me what the effect of phonon-phonon interaction on electron-phonon coupling would be ? Is it important at all ?

Best wishes,
LUCA

[sponce]

Dear LUCA,

I guess it depends on your system. For example, phonon-phonon interaction allows you to compute anharmonic phonons.
Therefore it could be very important. Picture a system with soft phonons that becomes positive when you take into account anharmonicity. In that case it can be very different.

Best,
Samuel