Lattice dynamics are underlying the basics of some smart materials:
(1)Ferroelectricity: optical phonons at play;
(2)Piezoelectricity: interactions between strain (which can be related to acoustic phonons) and optical phonons at play;
(3)Ferroelasticity: acoustic phonons at play;
(4)Multiferroics: spin+optical+acoustic phonons.
(5)Flexoelectricity: interpreted as a secondary piezoelectricity in this Letter [PRL, 105: 127601(2010)]
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