Mechanical Control of Graphene on Engineered Pyramidal Strain Arrays

Abstract

Strain can tune desirable electronic behavior in graphene, but there has been limited progress in controlling strain in graphene devices. In this paper, we study the mechanical response of graphene on substrates patterned with arrays of mesoscale pyramids. Using atomic force microscopy, we demonstrate that the morphology of graphene can be controlled from conformal to suspended depending on the arrangement of pyramids and the aspect ratio of the array. Non-uniform strains in graphene suspended across pyramids are revealed by Raman spectroscopy and supported by atomistic modeling, which also indicates strong pseudomagnetic fields in the graphene. Our results suggest that incorporating mesoscale pyramids in graphene devices is a viable route to achieving strain-engineering of graphene.

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• Strain control of hybridization between dark and localized excitons in a 2D semiconductor
• Preparing local strain patterns in graphene by atomic force microscope based indentation
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• Graphene Transport Mediated by Micropatterned Substrates
• Tight-binding Piezoelectric Theory and Electromechanical Coupling Correlations for Transition Metal Dichalcogenide Monolayers
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• Pseudomagnetic fields and strain engineering: graphene on GaN nanowires
• Shape Entropy of a Reconfigurable Ising Surface