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Title
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Theory of phonon dispersions and piezoelectricity in multilayers of hexagonal boron-nitride
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Author
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Abstract
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| 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. |
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Language
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English
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Source (journal)
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Physica status solidi: B: basic research. - Berlin
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Publication
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Berlin
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2011
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ISSN
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0370-1972
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DOI
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10.1002/PSSB.201100084
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Volume/pages
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248
:11
(2011)
, p. 2720-2723
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ISI
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000297517100069
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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