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Strain Superlattice of Graphene on Nanospheres

Strain engineering two-dimensional (2D) materials provides a new way to tailor electronic bandstructures and access novel electronic devices. A key route to strain 2D materials, such as graphene, is via underlying nanostructured substrates.

Building on work showing that graphene can be controllably strained on underlying nanospheres, the Illinois MRSEC team has now demonstrated that this strain dramatically affects the electronic properties of the graphene. Through joint experimental and theoretical work, the team found that conductance dips appear in the graphene-nanosphere “superlattice”, which can be tuned by adjusting the strain in the system. The team also showed that fabricated systems can show similar strain and electronic effects. These results show the promise of strain as a new parameter in tuning 2D electronic systems.