Phonon | Wikipedia audio article
Channel: wikipedia tts
Date: 08/12/2018

This is an audio version of the Wikipedia Article:
Phonon


00:00:57 1 Definition
00:01:41 2 Lattice dynamics
00:05:28 2.1 Lattice waves
00:06:31 2.2 One-dimensional lattice
00:06:54 2.2.1 Classical treatment
00:11:58 2.2.2 Quantum treatment
00:24:09 2.3 Three-dimensional lattice
00:24:32 2.4 Dispersion relation
00:25:02 2.5 Interpretation of phonons using second quantization techniques
00:29:07 3 Acoustic and optical phonons
00:36:01 4 Crystal momentum
00:38:57 5 Thermodynamics
00:41:10 6 Operator formalism
00:43:39 7 Nonlinearity
00:49:08 8 Predicted properties
00:49:14 9 See also
00:49:23 10 References
00:49:33 11 External links



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SUMMARY
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In physics, a phonon is a collective excitation in a periodic, elastic arrangement of atoms or molecules in condensed matter, like solids and some liquids. Often designated a quasiparticle, it represents an excited state in the quantum mechanical quantization of the modes of vibrations of elastic structures of interacting particles.
Phonons play a major role in many of the physical properties of condensed matter, like thermal conductivity and electrical conductivity. The study of phonons is an important part of condensed matter physics.
The concept of phonons was introduced in 1932 by Soviet physicist Igor Tamm. The name phonon comes from the Greek word φωνή (phonē), which translates to sound or voice because long-wavelength phonons give rise to sound. The name is based on the word photon.
Shorter-wavelength higher-frequency phonons are responsible for the majority of the thermal capacity of solids.