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Arizona Jeans Dark Fuzz. Jean Style. Phonons come in two types: acoustic and optic. Acoustic phonons act like sound waves, zipping through a crystal at a fixed speed regardless of their wavelength. They carry heat.
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In contrast, optic phonons generally have higher energies, move more slowly, and carry little heat. The two types of vibrations are very different: the simplest acoustic phonon consists of all the atoms sloshing back and forth in concert. The simplest optic phonon consists of neighboring atoms oscillating in opposite directions. Determining a phonon's individual properties, especially those of acoustic phonons, is then the basis of any knowledge-driven thermal engineering approach in energy-recovering and production strategies.
While phonon energies can be relatively easily measured by inelastic scattering techniques using X-rays or neutrons , this is not the case for the phonon attenuation, which translates into its intrinsic energy width, whose detection in crystals still remains beyond the current resolution limits of state-of-the art spectrometers.
Phonon attenuation is inversely proportional to its lifetime: the average time between two scattering processes, i. It is clearly fundamental to overcome technical limitations for achieving the experimental measurement of phonon lifetime and getting a microscopic understanding of thermal transport. Login Lost password?
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