acoustic branch

acoustic branch

[ə′küs·tik ‚branch]
(solid-state physics)
One of the parts of the dispersion relation, frequency as a function of wave number, for crystal lattice vibrations, representing vibration at low (acoustic) frequencies.
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References in periodicals archive ?
According to the dispersion analysis carried out in [19], acoustic branches of the HE and FSE are close to each other in the area between solid curves in Fig.
Dispersion analysis carried out in [19] shows good agreement between acoustic branches of the HE and FSE at the chosen datapoints.