Publication
Title
Theory of phonon dispersions and piezoelectricity in multilayers of hexagonal boron-nitride
Author
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.
Language
English
Source (journal)
Physica status solidi: B: basic research. - Berlin
Publication
Berlin : 2011
ISSN
0370-1972
Volume/pages
248:11(2011), p. 2720-2723
ISI
000297517100069
Full text (Publisher's DOI)
Full text (publisher's version - intranet only)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 06.02.2012
Last edited 23.06.2017
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