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Intrinsic ripples in graphene

Nature Materials volume 6, pages 858–861 (2007)Cite this article

Abstract

The stability of two-dimensional (2D) layers and membranes is the subject of a long-standing theoretical debate. According to the so-called Mermin–Wagner theorem1, long-wavelength fluctuations destroy the long-range order of 2D crystals. Similarly, 2D membranes embedded in a 3D space have a tendency to be crumpled2. These fluctuations can, however, be suppressed by anharmonic coupling between bending and stretching modes meaning that a 2D membrane can exist but will exhibit strong height fluctuations2,3,4. The discovery of graphene, the first truly 2D crystal5,6, and the recent experimental observation of ripples in suspended graphene7 make these issues especially important. Besides the academic interest, understanding the mechanisms of the stability of graphene is crucial for understanding electronic transport in this material that is attracting so much interest owing to its unusual Dirac spectrum and electronic properties8,9,10,11. We address the nature of these height fluctuations by means of atomistic Monte Carlo simulations based on a very accurate many-body interatomic potential for carbon12. We find that ripples spontaneously appear owing to thermal fluctuations with a size distribution peaked around 80 Å which is compatible with experimental findings7 (50–100 Å). This unexpected result might be due to the multiplicity of chemical bonding in carbon.

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Figure 1: A representative configuration of the N=8,640 sample at T=300 K.
Figure 2: Fourier transform of the correlation function of the normals.
Figure 3: Portion of one typical configuration of the N=8,640 sample at T=300 K.
Figure 4: Radial distribution function for the N=8,640 sample at T=300 K and T=3,500 K as a function of interatomic distance.

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Acknowledgements

We are grateful to D. Nelson, J. C. Maan, A. Geim, K. Novoselov and J. Meyer for helpful discussions. This work was supported by the Stichting voor Fundamenteel Onderzoek der Materie (FOM), the Netherlands.

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Authors and Affiliations

  1. Institute for Molecules and Materials, Radboud University Nijmegen, Toernooiveld 1, 6525ED Nijmegen, The Netherlands

    A. Fasolino, J. H. Los & M. I. Katsnelson

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  1. A. Fasolino
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  2. J. H. Los
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  3. M. I. Katsnelson
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Correspondence to A. Fasolino.

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Fasolino, A., Los, J. & Katsnelson, M. Intrinsic ripples in graphene. Nature Mater 6, 858–861 (2007). https://doi.org/10.1038/nmat2011

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