Nano Archive

Band gap of strained graphene nanoribbons

Lu, Yang and Guo, Jing (2010) Band gap of strained graphene nanoribbons. Nano Research, 3 (3). pp. 189-199.

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The band structures of strained graphene nanoribbons (GNRs) are examined using a tight-binding Hamiltonian that is directly related to the type and magnitude of strain. Compared to a two-dimensional graphene whose band gap remains close to zero even if a large strain is applied, the band gap of a graphene nanoribbon (GNR) is sensitive to both uniaxial and shear strains. The effect of strain on the electronic structure of a GNR depends strongly on its edge shape and structural indices. For an armchair GNR, a weak uniaxial strain changes the band gap in a linear fashion, whereas a large strain results in periodic oscillation of the band gap. On the other hand, shear strain always tends to reduce the band gap. For a zigzag GNR, the effect of strain is to change the spin polarization at the edges of GNR, and thereby modulate the band gap. A simple analytical model, which agrees with the numerical results, is proposed to interpret the response of the band gap to strain in armchair GNRs.

Item Type:Article
Uncontrolled Keywords:Graphene nanoribbons (GNRs), band gap, strain
Subjects:Physical Science > Nanophysics
Physical Science > Nanoelectronics
ID Code:9018
Deposited By:Lesley Tobin
Deposited On:22 Jun 2010 16:04
Last Modified:22 Jun 2010 16:04

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