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  Lenosky's energy and the phonon dispersion of graphene

Viola-Kusminskiy, S., Campbell, D. K., & Castro Neto, A. H. (2009). Lenosky's energy and the phonon dispersion of graphene. PHYSICAL REVIEW B, 80(3): 035401. doi:10.1103/PhysRevB.80.035401.

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 Creators:
Viola-Kusminskiy, Silvia1, 2, Author           
Campbell, D. K.2, Author
Castro Neto, A. H.2, Author
Affiliations:
1External Organizations, ou_persistent22              
2Boston University, ou_persistent22              

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 Abstract: We calculate the phonon spectrum for a graphene sheet resulting from the model proposed by Lenosky et al. [Nature (London) 355, 333 (1992)] for the free energy of the lattice. This model takes into account not only the usual bond-bending and stretching terms, but it also captures the possible misalignment of the p(z) orbitals. We compare our results with previous models used in the literature and with available experimental data. We show that while this model provides an excellent description of the flexural modes in graphene, an extra term in the energy is needed for it to be able to reproduce the full phonon dispersion correctly beyond the Gamma point.

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Language(s): eng - English
 Dates: 2009-07
 Publication Status: Issued
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevB.80.035401
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Title: PHYSICAL REVIEW B
Source Genre: Journal
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Publ. Info: American Physical Society
Pages: - Volume / Issue: 80 (3) Sequence Number: 035401 Start / End Page: - Identifier: ISSN: 1098-0121