Symmetry properties of vibrational modes in graphene nanoribbons

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Details zur Publikation

Autor(en): Gillen R, Mohr M, Maultzsch J
Zeitschrift: Physical Review B
Verlag: AMER PHYSICAL SOC
Jahr der Veröffentlichung: 2010
Band: 81
Heftnummer: 20
ISSN: 1098-0121


Abstract


We present symmetry properties of the lattice vibrations of graphene nanoribbons with pure armchair (AGNRs) and zigzag edges (ZGNRs). In nonsymmorphic nanoribbons, the phonon modes at the edge of the Brillouin zone are twofold degenerate whereas the phonon modes in symmorphic nanoribbons are nondegenerate. We identified the Raman-active and infrared-active modes. We predict 3N and 3 (N+1) Raman-active modes for N-ZGNRs and N-AGNRs, respectively (N is the number of dimers per unit cell). These modes can be used for the experimental characterization of graphene nanoribbons. Calculations based on density-functional theory suggest that the frequency splitting of the LO and TO modes in AGNRs (corresponding to the E-2g mode in graphene) exhibits characteristic width and family dependence. Further, all graphene nanoribbons have a Raman-active breathing like mode, the frequency of which is inversely proportional to the nanoribbon width and thus might be used for experimental determination of the width of graphene nanoribbons.


FAU-Autoren / FAU-Herausgeber

Gillen, Roland
Lehrstuhl für Experimentalphysik
Maultzsch, Janina Prof. Dr.
Lehrstuhl für Experimentalphysik


Autor(en) der externen Einrichtung(en)
Technische Universität Berlin


Zitierweisen

APA:
Gillen, R., Mohr, M., & Maultzsch, J. (2010). Symmetry properties of vibrational modes in graphene nanoribbons. Physical Review B, 81(20). https://dx.doi.org/10.1103/PhysRevB.81.205426

MLA:
Gillen, Roland, Marcel Mohr, and Janina Maultzsch. "Symmetry properties of vibrational modes in graphene nanoribbons." Physical Review B 81.20 (2010).

BibTeX: 

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