Hopkinson, Jack and Hancock, Y orcid.org/0000-0003-4799-2783 (2022) Tight-binding studies of uniaxial strain in T-graphene nanoribbons. Journal of physics : Condensed matter. 214001. ISSN 1361-648X
Abstract
The role of uniaxial strain in armchair, T-graphene nanoribbons (ATGNRs) with symmetric and asymmetric structures is investigated using a nearest- neighbour, tight-binding model. ATGNRs with structural symmetry and two a sub- lattice structure exhibit Dirac points at zero strain. Application of uniaxial strain to these systems induces multiple Dirac points under compression (up to -20% strain), with the number of these points commensurate with the number of tetra-carbon base- units along the width of the unit cell, accounting also for the mirror symmetry of the structure. Under tensile, uniaxial strain (up to 20% extension), the induced asymmetry in the carbon tetrabond results in the number of Dirac points being reduced, although a minimum number are preserved due to the fundamental mirror-symmetry of the symmetric ATGNR. Asymmetric ATGNRs, which are semiconductors, are shown to have tunable band-gaps that decrease as a function of increasing ribbon width and uniaxial strain. Uniaxial strain induces a single Dirac point at the band edge of these systems under high compression (>16%), with the closing of the band gap linked to symmetry-induced perturbations in the structure that override the symmetry-breaking, gap-opening mechanisms. In summary, the TB model shows ATGNRs to have suitable device features for flexible electronics applications, such as band-gap tuning, and for the strain engineering of relativistic properties.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 The Author(s) |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Physics (York) The University of York |
Depositing User: | Pure (York) |
Date Deposited: | 24 May 2024 08:30 |
Last Modified: | 16 Oct 2024 18:17 |
Published Version: | https://doi.org/10.1088/1361-648X/ac5a02 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1088/1361-648X/ac5a02 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:212770 |
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