The phonons travel at less than the speed of light.

Most systems will show two separate bands on which phonons live.

So then, phonons are just a concept used to describe something which happens?

Phonon flux is still present, but carries less of the energy.

Most phonons have less energy than a photon of visible light.

That's what they saw, which demonstrates that the phonons are coherent.

These phonons repeatedly bounce from one layer to the other.

In doing so, the photon loses exactly one phonon worth of energy.

This model is complex enough to display the salient features of phonons.

The are called the occupation number of the phonons.

A peak to the left is that for the annihilation of a phonon.

It remains unclear whether phonons got back his land.

To understand why phonons exist, complicated quantum mechanics is needed.

But the phonon model breaks down at higher temperatures - the vibrations are just too large.

So the atoms themselves are constantly creating and absorbing phonons.

If you were to go looking for entanglement in phonons, diamond is the material of choice.

This has suggested a new criterion for glass formation based on the value of the phonon mean free path.

Finally, the carrier system cools down under the emission of phonons.

This can cause strong phonon scattering but would not affect charge transport.

This behavior can be attributed to the optical processes with participation of two or more phonons.

The thermal resistance then results from the transfer of phonons across the interface.

Despite its 2-D nature, graphene has 3 acoustic phonon modes.

This energy is quantized in the form of phonons.

This randomness is a quantum phenomenon as well (see phonon).

Optical phonons that interact in this way with light are called infrared active.