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On the force constants of graphene
Authors:S. Yu. Davydov
Affiliation:(1) Institute of Applied Beam Science, Ibaraki University, Mito 310-8512, Japan;(2) College of Physics and Electronics Information, Inner Mongolia University for the Nationalities, Tongliao, 028043, China;(3) Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, 40132, Indonesia;(4) Institute of Applied Beam Science, Ibaraki University, Hitachi 316-8511, Japan;(5) Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai 319-1195, Japan;(6) Department of Physics, Faculty of Engineering, Setsunan University, Neyagawa 572-8508, Japan
Abstract:It has been shown that the inclusion of an additional short-range potential in the repulsion energy of neighboring atoms allows one to satisfactorily describe the frequency of the phonon doublet at the Γ point for atomic vibrations in the plane of the graphene sheet and to calculate the corresponding Grüneisen coefficient. The results obtained are compared with those derived by other authors.
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