Condensed Matter Seminar: "Bending Rules in Graphene Kirigami"

Wed, 09/02/2015 - 16:00 - 18:00
Gene Mele (University of Pennsylvania)

The three dimensional shapes of graphene sheets produced by nanoscale cut-and--join kirigami are studied by combining large-scale atomistic modelling with continuum elastic theory. Lattice segments are selectively removed from a flat graphene sheet and the structure is allowed to close and reconstruct by relaxing in the third dimension. The surface relaxation is limited by a nonzero bending modulus which produces a smoothly modulated landscape instead of the ridge-and-plateau motif found in macroscopic lattice kirigami. The resulting surface shapes and their interactions are well described by a new set of microscopic kirigami rules that resolve the competition between the bending and stretching energies. Applications to designing structures with strain induced gauge fields will be discussed.

David Rittenhouse Laboratory, A4