Title
Theory of phonon dispersions and piezoelectricity in multilayers of hexagonal boron-nitride Theory of phonon dispersions and piezoelectricity in multilayers of hexagonal boron-nitride
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Berlin ,
Subject
Physics
Source (journal)
Physica status solidi: B: basic research. - Berlin
Volume/pages
248(2011) :11 , p. 2720-2723
ISSN
0370-1972
ISI
000297517100069
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Taking into account covalent, Coulomb and van der Waals interactions, we construct the dynamical matrix and calculate the phonon dispersion relations for multilayer crystals of hexagonal boron-nitride. Coulomb interactions account for a strong overbending of optical phonons. Applying and extending Born's long-wave theory to the case of multilayer crystals, we calculate the piezoelectric stress constant equation image as a function of the number of layers equation image. In agreement with group theory, we find that equation image for equation image even; for an uneven number equation image of layers we obtain equation image, i.e. the piezoelectric constant decreases as equation image.
E-info
https://repository.uantwerpen.be/docman/iruaauth/7d250a/a1bf07df1b7.pdf
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