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Discontinuous evolution of the structure of stretching polycrystalline graphene
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita).ORCID-id: 0000-0002-3000-5393
Rekke forfattare: 32019 (engelsk)Inngår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 100, nr 16, artikkel-id 161402Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2019. Vol. 100, nr 16, artikkel-id 161402
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URN: urn:nbn:se:su:diva-175798DOI: 10.1103/PhysRevB.100.161402ISI: 000489824200002OAI: oai:DiVA.org:su-175798DiVA, id: diva2:1372123
Tilgjengelig fra: 2019-11-22 Laget: 2019-11-22 Sist oppdatert: 2019-12-09bibliografisk kontrollert

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