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Band structure engineering of graphene by strain: First-principles calculations
Abstract
We have investigated the electronic structure of graphene under different planar strain distributions using the first-principles pseudopotential plane-wave method and the tight-binding approach. We found that graphene with a symmetrical strain distribution is always a zero band-gap semiconductor and its pseudogap decreases linearly with the strain strength in the elastic regime. However, asymmetrical strain distributions in graphene result in opening of band gaps at the Fermi level. For the graphene with a strain distribution parallel to C-C bonds, its band gap continuously increases to its maximum width of 0.486 eV as the strain increases up to 12.2%. For the graphene with a strain distribution perpendicular to C-C bonds, its band gap continuously increases only to its maximum width of 0.170 eV as the strain increases up to 7.3%. The anisotropic nature of graphene is also reflected by different Poisson ratios under large strains in different directions. We found that the Poisson ratio approaches to a constant of 0.1732 under small strains but decreases differently under large strains along different directions.
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Self-citation
Metadata
- Authors
- Gui, G., Li, J., & Zhong, J.
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 2008-08-25
- Volume
- 78
- Issue
- 7
- ISSN
- 1098-0121 (ISSN-L)
- 1550-235X
- OpenAlex
- W2006157333
- Cited by
- 667
- References
- 27
- FWCI
- 9.77
- Type
- journal article
- Language
- en
- Open access
- closed
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