Strongly localized states and giant optical absorption induced by multiple flat-bands in AA-stacked multilayer armchair graphene nanoribbons
We propose an AA-stacked multilayer graphene nanoribbon with two symmetrical armchair edges as a multiple flat-band (FB) material. Using the tight-binding Hamiltonian and Green’s function method, we find that the FBs are complete and merged into many dispersive bands. The FBs cause multiple strongly...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/ac4b90 |
| _version_ | 1827871220786266112 |
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| author | Xiongwen Chen Qian Wang Ping Wu Guanghui Zhou |
| author_facet | Xiongwen Chen Qian Wang Ping Wu Guanghui Zhou |
| author_sort | Xiongwen Chen |
| collection | DOAJ |
| description | We propose an AA-stacked multilayer graphene nanoribbon with two symmetrical armchair edges as a multiple flat-band (FB) material. Using the tight-binding Hamiltonian and Green’s function method, we find that the FBs are complete and merged into many dispersive bands. The FBs cause multiple strongly localized states (SLSs) at the sites of the odd lines in every sublayer and a giant optical absorption (GOA) at energy point 2 t , where t is the electronic intralayer hopping energy between two nearest-neighbor sites. By driving an electric field perpendicular to the ribbon plane, the bandgaps of the FBs are tunable. Accordingly, the positions of the SLSs in the energy regime can be shifted. However, the position of the GOA is robust against such field, but its strength exhibits a collapse behavior with a fixed quantization step. On the contrary, by driving an electric field parallel to the ribbon plane, the completeness of FBs is destroyed. Resultantly, the SLSs and GOA are suppressed and even quenched. Therefore, such ribbons may be excellent candidates for the design of the controllable information-transmission and optical-electric nanodevices. |
| first_indexed | 2024-03-12T16:06:32Z |
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| id | doaj.art-64fed44ef85349248bd49d6166da467b |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:06:32Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
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| series | New Journal of Physics |
| spelling | doaj.art-64fed44ef85349248bd49d6166da467b2023-08-09T14:19:50ZengIOP PublishingNew Journal of Physics1367-26302022-01-0124202301010.1088/1367-2630/ac4b90Strongly localized states and giant optical absorption induced by multiple flat-bands in AA-stacked multilayer armchair graphene nanoribbonsXiongwen Chen0Qian Wang1Ping Wu2Guanghui Zhou3https://orcid.org/0000-0002-1536-3440Department of Physics, Huaihua University , Huaihua 418008, People’s Republic of China; Key Laboratory for Low-Dimensional Structures and Quantum Manipulation, Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University , Changsha 410081, People’s Republic of ChinaDepartment of Physics, Huaihua University , Huaihua 418008, People’s Republic of China; Key Laboratory for Low-Dimensional Structures and Quantum Manipulation, Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University , Changsha 410081, People’s Republic of ChinaDepartment of Physics, Huaihua University , Huaihua 418008, People’s Republic of ChinaKey Laboratory for Low-Dimensional Structures and Quantum Manipulation, Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University , Changsha 410081, People’s Republic of ChinaWe propose an AA-stacked multilayer graphene nanoribbon with two symmetrical armchair edges as a multiple flat-band (FB) material. Using the tight-binding Hamiltonian and Green’s function method, we find that the FBs are complete and merged into many dispersive bands. The FBs cause multiple strongly localized states (SLSs) at the sites of the odd lines in every sublayer and a giant optical absorption (GOA) at energy point 2 t , where t is the electronic intralayer hopping energy between two nearest-neighbor sites. By driving an electric field perpendicular to the ribbon plane, the bandgaps of the FBs are tunable. Accordingly, the positions of the SLSs in the energy regime can be shifted. However, the position of the GOA is robust against such field, but its strength exhibits a collapse behavior with a fixed quantization step. On the contrary, by driving an electric field parallel to the ribbon plane, the completeness of FBs is destroyed. Resultantly, the SLSs and GOA are suppressed and even quenched. Therefore, such ribbons may be excellent candidates for the design of the controllable information-transmission and optical-electric nanodevices.https://doi.org/10.1088/1367-2630/ac4b90multilayer armchair graphene nanoribbonsmultiple flat bandsselective localization rulegiant optical absorptionelectric-field manipulation |
| spellingShingle | Xiongwen Chen Qian Wang Ping Wu Guanghui Zhou Strongly localized states and giant optical absorption induced by multiple flat-bands in AA-stacked multilayer armchair graphene nanoribbons New Journal of Physics multilayer armchair graphene nanoribbons multiple flat bands selective localization rule giant optical absorption electric-field manipulation |
| title | Strongly localized states and giant optical absorption induced by multiple flat-bands in AA-stacked multilayer armchair graphene nanoribbons |
| title_full | Strongly localized states and giant optical absorption induced by multiple flat-bands in AA-stacked multilayer armchair graphene nanoribbons |
| title_fullStr | Strongly localized states and giant optical absorption induced by multiple flat-bands in AA-stacked multilayer armchair graphene nanoribbons |
| title_full_unstemmed | Strongly localized states and giant optical absorption induced by multiple flat-bands in AA-stacked multilayer armchair graphene nanoribbons |
| title_short | Strongly localized states and giant optical absorption induced by multiple flat-bands in AA-stacked multilayer armchair graphene nanoribbons |
| title_sort | strongly localized states and giant optical absorption induced by multiple flat bands in aa stacked multilayer armchair graphene nanoribbons |
| topic | multilayer armchair graphene nanoribbons multiple flat bands selective localization rule giant optical absorption electric-field manipulation |
| url | https://doi.org/10.1088/1367-2630/ac4b90 |
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