Controlling Energy Gap of Bilayer Graphene by Strain

Details Controlling Energy Gap of Bilayer Graphene by Strain Controlling Energy Gap of Bilayer Graphene by Strain

2010-02-25

arxiv.org/abs/1002.4685v2

Nano Letters 10, 3486-3489 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures; reference added; some sentences modified slightly

Scientific paper

10.1021/nl101617x

Using the first principles calculations, we show that mechanically tunable electronic energy gap is realizable in bilayer graphene if different homogeneous strains are applied to the two layers. It is shown that the size of energy gap can be simply controlled by adjusting the strength and direction of these strains. We also show that the effect originates from the occurrence of strain-induced pseudo-scalar potentials in graphene. When homogeneous strains with different strengths are applied to each layer of bilayer graphene, transverse electric fields across the two layers can be generated without any external electronic sources, thereby opening an energy gap. The results demonstrate a simple mechanical method of realizing pseudo-electromagnetism in graphene and suggest a maneuverable approach to fabrication of electromechanical devices based on bilayer graphene.

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