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Discontinuous evolution of the structure of stretching polycrystalline graphene
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).ORCID iD: 0000-0002-3000-5393
Number of Authors: 32019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, no 16, article id 161402Article in journal (Refereed) Published
Abstract [en]

Polycrystalline graphene has an inherent tendency to buckle, i.e., develop out-of-plane, three-dimensional structure. A force applied to stretch a piece of polycrystalline graphene influences the out-of-plane structure. Even if the graphene is well relaxed, this happens in nonlinear fashion: Occasionally, a tiny increase in stretching force induces a significant displacement, in close analogy to avalanches, which in turn can create vibrations in the surrounding medium. We establish this effect in computer simulations: By continuously changing the strain, we follow the displacements of the carbon atoms that turn out to exhibit a discontinuous evolution. Furthermore, the displacements exhibit a hysteretic behavior upon the change from low to high stress and back. These behaviors open up another direction in studying dynamical elasticity of polycrystalline quasi-two-dimensional systems, and in particular the implications on their mechanical and thermal properties.

Place, publisher, year, edition, pages
2019. Vol. 100, no 16, article id 161402
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-175798DOI: 10.1103/PhysRevB.100.161402ISI: 000489824200002OAI: oai:DiVA.org:su-175798DiVA, id: diva2:1372123
Available from: 2019-11-22 Created: 2019-11-22 Last updated: 2019-12-09Bibliographically approved

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