Transmission spectra and valley processing of graphene and carbon nanotube superlattices with inter-valley coupling
We numerically investigate the electronic transport properties of graphene nanoribbons and carbon nanotubes with inter-valley coupling, e.g., in $\sqrt{3}N\times \sqrt{3}N$ and $3N\times 3N$ superlattices. By taking the $\sqrt{3}\times \sqrt{3}$ graphene superlattice as an example, we show that tail...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2016-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/18/11/113011 |
| _version_ | 1797750814981226496 |
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| author | Fuming Xu Zhizhou Yu Yafei Ren Bin Wang Yadong Wei Zhenhua Qiao |
| author_facet | Fuming Xu Zhizhou Yu Yafei Ren Bin Wang Yadong Wei Zhenhua Qiao |
| author_sort | Fuming Xu |
| collection | DOAJ |
| description | We numerically investigate the electronic transport properties of graphene nanoribbons and carbon nanotubes with inter-valley coupling, e.g., in $\sqrt{3}N\times \sqrt{3}N$ and $3N\times 3N$ superlattices. By taking the $\sqrt{3}\times \sqrt{3}$ graphene superlattice as an example, we show that tailoring the bulk graphene superlattice results in rich structural configurations of nanoribbons and nanotubes. After studying the electronic characteristics of the corresponding armchair and zigzag nanoribbon geometries, we find that the linear bands of carbon nanotubes can lead to the Klein tunnelling-like phenomenon, i.e., electrons propagate along tubes without backscattering even in the presence of a barrier. Due to the coupling between K and ${K}^{\prime }$ valleys of pristine graphene by $\sqrt{3}\times \sqrt{3}$ supercells, we propose a valley-field-effect transistor based on the armchair carbon nanotube, where the valley polarization of the current can be tuned by applying a gate voltage or varying the length of the armchair carbon nanotubes. |
| first_indexed | 2024-03-12T16:38:20Z |
| format | Article |
| id | doaj.art-39f25e62500140b98b65427558079610 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:38:20Z |
| publishDate | 2016-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-39f25e62500140b98b654275580796102023-08-08T14:37:26ZengIOP PublishingNew Journal of Physics1367-26302016-01-01181111301110.1088/1367-2630/18/11/113011Transmission spectra and valley processing of graphene and carbon nanotube superlattices with inter-valley couplingFuming Xu0Zhizhou Yu1Yafei Ren2Bin Wang3Yadong Wei4Zhenhua Qiao5College of Physics and Energy, Shenzhen University , Shenzhen 518060, People's Republic of ChinaDepartment of Physics and Center of Theoretical and Computational Physics, The University of Hong Kong , Hong Kong, People's Republic of ChinaICQD, Hefei National Laboratory for Physical Science at Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China; CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of ChinaCollege of Physics and Energy, Shenzhen University , Shenzhen 518060, People's Republic of ChinaCollege of Physics and Energy, Shenzhen University , Shenzhen 518060, People's Republic of ChinaICQD, Hefei National Laboratory for Physical Science at Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China; CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of ChinaWe numerically investigate the electronic transport properties of graphene nanoribbons and carbon nanotubes with inter-valley coupling, e.g., in $\sqrt{3}N\times \sqrt{3}N$ and $3N\times 3N$ superlattices. By taking the $\sqrt{3}\times \sqrt{3}$ graphene superlattice as an example, we show that tailoring the bulk graphene superlattice results in rich structural configurations of nanoribbons and nanotubes. After studying the electronic characteristics of the corresponding armchair and zigzag nanoribbon geometries, we find that the linear bands of carbon nanotubes can lead to the Klein tunnelling-like phenomenon, i.e., electrons propagate along tubes without backscattering even in the presence of a barrier. Due to the coupling between K and ${K}^{\prime }$ valleys of pristine graphene by $\sqrt{3}\times \sqrt{3}$ supercells, we propose a valley-field-effect transistor based on the armchair carbon nanotube, where the valley polarization of the current can be tuned by applying a gate voltage or varying the length of the armchair carbon nanotubes.https://doi.org/10.1088/1367-2630/18/11/113011valley polarizationgraphene supercellelectron transport72.10.-d81.05.Ue73.23.-b |
| spellingShingle | Fuming Xu Zhizhou Yu Yafei Ren Bin Wang Yadong Wei Zhenhua Qiao Transmission spectra and valley processing of graphene and carbon nanotube superlattices with inter-valley coupling New Journal of Physics valley polarization graphene supercell electron transport 72.10.-d 81.05.Ue 73.23.-b |
| title | Transmission spectra and valley processing of graphene and carbon nanotube superlattices with inter-valley coupling |
| title_full | Transmission spectra and valley processing of graphene and carbon nanotube superlattices with inter-valley coupling |
| title_fullStr | Transmission spectra and valley processing of graphene and carbon nanotube superlattices with inter-valley coupling |
| title_full_unstemmed | Transmission spectra and valley processing of graphene and carbon nanotube superlattices with inter-valley coupling |
| title_short | Transmission spectra and valley processing of graphene and carbon nanotube superlattices with inter-valley coupling |
| title_sort | transmission spectra and valley processing of graphene and carbon nanotube superlattices with inter valley coupling |
| topic | valley polarization graphene supercell electron transport 72.10.-d 81.05.Ue 73.23.-b |
| url | https://doi.org/10.1088/1367-2630/18/11/113011 |
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