optical phonon


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Related to optical phonon: Lattice vibration

optical phonon

[′äp·tə·kəl ′fō‚nän]
(solid-state physics)
A quantum of an optical mode of vibration of a crystal lattice.
References in periodicals archive ?
These signals can be assigned to the fundamental longitudinal optical phonon mode [E.sub.1](LO) and its first overtone mode (2LO), respectively [28, 29].
Processes (0) and (0') are transitions that do not require a phonon, whereas processes (1) and ([1.sup.[dagger]]) require an optical phonon. Similarly, (n) and ([n.sup.[dagger]]) are transitions involving n optical phonons (n = 2,3,4,...).
Wasilewski, "Optical phonons in [Al.sub.x][Ga.sub.1 - x]As: raman spectroscopy," Physical Review B: Condensed Matter and Materials Physics, vol.
The decrease in drift mobility with temperature at low fields is due to increased intra-valley polar optical phonon scattering whereas the decrease in velocity at higher fields is due to increased intra and inter valley scattering.
The corresponding average optical phonon energy is given within the present formalism (due to (21)) just by the fourth discrete oscillator; that is, [[bar.[epsilon]].sub.U] = [[bar.[epsilon]].sub.TO&LO] = [[epsilon].sub.4].
In short-period superlattice, the large gaps between acoustic and optical phonon branches make the scattering rarely happen and thus lead to high thermal conductivity, even higher than its corresponding pure materials.
Choi, "Derivation of linewidths for optical transitions in quantum wells due to longitudinal optical phonon scattering," Journal of Physics Condensed Matter, vol.
George, "Optical phonon confinement in ZnO nanorods and nanotubes," Indian Journal of Pure and Applied Physics, vol.
On the other hand, vibration with frequencies corresponding to optical phonon modes in various materials has been observed by pump-probe spectroscopy.
In our previous work, the carrier escape and capture processes between the unconfined bulk states and the confined quantum states have been calculated from the first principle by evaluating the carrier-polar optical phonon interactions, and the details of their physical meaning have been discussed and will not be repeated here for simplicity.
They show a dominant peak of typical characteristic of the wurtzite ZnO structure at 439 [cm.sup.-1], assigned to be the optical phonon E2H mode.
There are nine zone-center optical phonon modes with symmetries 4[A.sub.u] + 5[B.sub.u] + [A.sub.g] + 2[B.sub.g]; only three [A.sub.g] + 2[B.sub.g] modes are Raman active.

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