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(Color online) Geometries considered in the simulations (a) pristine GNR, (b) circular hole GNR, and (c) graphene sheet with triangular hole. The white colored atoms refer to H atoms which mark the termination of GNR.
Band structure of the GNR with triangular holes. The band gap highlights dielectric behavior. The other geometries taken under study displayed similar band openings.
(Color online) The development of polarization for triangular-hole-graphene sheet under the action of strain.
(Color online) Average polarization as a function of applied strain. For comparison, identical curves are shown for well-know naturally piezoelectric materials.
A finite element model based on elasticity theory provides an indication of the qualitative nature of the strain distribution around the triangular hole.
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