# What is the phonon/lattice interaction?

To my understanding, phonons in solids are an excited state of a lattice, i.e., a lattice of atoms oscillate at a certain frequency. Phonons are quasipartices.

But what should the phonon/lattice interaction be?

I found this term in the abstract of Jie Chen et al., http://www.pnas.org/content/pnas/108/47/18887.full.pdf.

• Usually phonons are defined in the context of the harmonic lattice approximation, assuming an ideal lattice. In principle there are anharmonicities, leading to phonon-phonon interactions, and some level of disorder/defects. I'd guess phonon-lattice interaction refers to interaction with the latter, as a phonon traveling through a crystal should experience a different potential near a defect. Oct 7, 2018 at 19:47