Band gap of strained graphene nanoribbons

By Yang Lu, Jing Guo. 2009

190 citations recorded by the source corpus.

AbstractThe 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.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/f672e8419dd11318d02e708d0c8b85a73bb1ceb6

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

1. Francisco Guinea
2. A. Grushin
3. M. Vozmediano
4. R. Roldán
5. Hector Ochoa
6. Pablo Perez San-José
7. Xiaowei Jiang
8. Zhongfan Liu

In Materials Chemistry

1. Francisco Guinea
2. A. Grushin
3. Hector Ochoa
4. M. Vozmediano
5. R. Roldán
6. Fernado de Juan
7. Alberto Cortijo
8. V. Parente

Citations in the corpus

• Strain effects in graphene and graphene nanoribbons: The underlying mechanism (2010, methodology): “Very recently, a TB calculation was conducted to investigate the effects of both uniaxial and shear strains on GNRs, and an analytical solution at k = 0 was obtained to provide physical insights into understanding the response of AGNRs [35].”
• Novel effects of strains in graphene and other two dimensional materials (2015, background): “However, tight binding calculations for graphene nanoribbons predict that realistically small uniaxial strain results in a periodic modulation of the bandgap in armchair ribbons, while in zigzag ribbons it creates a band gap proportional to the magnitude of applied tensile strain [225].”