Robust signatures in the current–voltage characteristics of DNA molecules oriented between two graphene nanoribbon electrodes
In this work, we numerically calculate the electric current through three kinds of DNA sequences (telomeric, λ -DNA and p53-DNA) described by different heuristic models. A bias voltage is applied between two zigzag edged graphene contacts attached to the DNA segments, while a gate terminal modulates...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2012-01-01
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| Series: | New Journal of Physics |
| Online Access: | https://doi.org/10.1088/1367-2630/14/9/093049 |
| _version_ | 1797751819008475136 |
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| author | Carlos J Páez Peter A Schulz Neil R Wilson Rudolf A Römer |
| author_facet | Carlos J Páez Peter A Schulz Neil R Wilson Rudolf A Römer |
| author_sort | Carlos J Páez |
| collection | DOAJ |
| description | In this work, we numerically calculate the electric current through three kinds of DNA sequences (telomeric, λ -DNA and p53-DNA) described by different heuristic models. A bias voltage is applied between two zigzag edged graphene contacts attached to the DNA segments, while a gate terminal modulates the conductance of the molecule. Calculation of the current is performed by integrating the transmission function (calculated using the lattice Green's function) over the range of energies allowed by the chemical potentials. We show that a telomeric DNA sequence, when treated as a quantum wire in the fully coherent low-temperature regime, works as an excellent semiconductor. Clear steps are apparent in the current–voltage curves of telomeric sequences and are present independent of length and sequence initialization at the contacts. We also find that the molecule–electrode coupling can drastically influence the magnitude of the current. The difference between telomeric DNA and other DNAs, such as λ -DNA and DNA for the tumour suppressor p53, is particularly visible in the length dependence of the current. |
| first_indexed | 2024-03-12T16:54:06Z |
| format | Article |
| id | doaj.art-e6a6f8a8b7ce4790b3f031943e4dc8f9 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:54:06Z |
| publishDate | 2012-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-e6a6f8a8b7ce4790b3f031943e4dc8f92023-08-08T11:02:38ZengIOP PublishingNew Journal of Physics1367-26302012-01-0114909304910.1088/1367-2630/14/9/093049Robust signatures in the current–voltage characteristics of DNA molecules oriented between two graphene nanoribbon electrodesCarlos J Páez0Peter A Schulz1Neil R Wilson2Rudolf A Römer3Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas , Rua Sérgio Buarque de Holanda, 777 Cidade Universitária 13083-859 Campinas, SP, Brazil; Faculdade de Ciências Aplicadas, Universidade Estadual de Campinas , 13484-350 Limeira, SP, BrazilInstituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas , Rua Sérgio Buarque de Holanda, 777 Cidade Universitária 13083-859 Campinas, SP, Brazil; Faculdade de Ciências Aplicadas, Universidade Estadual de Campinas , 13484-350 Limeira, SP, BrazilDepartment of Physics, University of Warwick , Coventry CV4 7AL, UKDepartment of Physics, University of Warwick , Coventry CV4 7AL, UK; Centre for Scientific Computing, University of Warwick , Coventry CV4 7AL, UKIn this work, we numerically calculate the electric current through three kinds of DNA sequences (telomeric, λ -DNA and p53-DNA) described by different heuristic models. A bias voltage is applied between two zigzag edged graphene contacts attached to the DNA segments, while a gate terminal modulates the conductance of the molecule. Calculation of the current is performed by integrating the transmission function (calculated using the lattice Green's function) over the range of energies allowed by the chemical potentials. We show that a telomeric DNA sequence, when treated as a quantum wire in the fully coherent low-temperature regime, works as an excellent semiconductor. Clear steps are apparent in the current–voltage curves of telomeric sequences and are present independent of length and sequence initialization at the contacts. We also find that the molecule–electrode coupling can drastically influence the magnitude of the current. The difference between telomeric DNA and other DNAs, such as λ -DNA and DNA for the tumour suppressor p53, is particularly visible in the length dependence of the current.https://doi.org/10.1088/1367-2630/14/9/093049 |
| spellingShingle | Carlos J Páez Peter A Schulz Neil R Wilson Rudolf A Römer Robust signatures in the current–voltage characteristics of DNA molecules oriented between two graphene nanoribbon electrodes New Journal of Physics |
| title | Robust signatures in the current–voltage characteristics of DNA molecules oriented between two graphene nanoribbon electrodes |
| title_full | Robust signatures in the current–voltage characteristics of DNA molecules oriented between two graphene nanoribbon electrodes |
| title_fullStr | Robust signatures in the current–voltage characteristics of DNA molecules oriented between two graphene nanoribbon electrodes |
| title_full_unstemmed | Robust signatures in the current–voltage characteristics of DNA molecules oriented between two graphene nanoribbon electrodes |
| title_short | Robust signatures in the current–voltage characteristics of DNA molecules oriented between two graphene nanoribbon electrodes |
| title_sort | robust signatures in the current voltage characteristics of dna molecules oriented between two graphene nanoribbon electrodes |
| url | https://doi.org/10.1088/1367-2630/14/9/093049 |
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