DISPERSION RELATIONS IN BILAYER GRAPHENE AT FINITE TEMPERATURE
It is well-known that material technology is considered as one of the scientific fields attracting a lot of attention from scientists. Recently, graphene, a perfect two-dimensional structure, has attracted a large amount of interest from researchers due to its unique properties and possible applicat...
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| Format: | Article |
| Language: | English |
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Dalat University
2021-07-01
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| Series: | Tạp chí Khoa học Đại học Đà Lạt |
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| Online Access: | https://tckh.dlu.edu.vn/index.php/tckhdhdl/article/view/882 |
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| _version_ | 1832569043821789184 |
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| author | Nguyen Van Men |
| author_facet | Nguyen Van Men |
| author_sort | Nguyen Van Men |
| collection | DOAJ |
| description | It is well-known that material technology is considered as one of the scientific fields attracting a lot of attention from scientists. Recently, graphene, a perfect two-dimensional structure, has attracted a large amount of interest from researchers due to its unique properties and possible applications in a variety of technological fields. The dispersion relations in graphene demonstrate that this material can be used to create plasmonic devices with potentially more features and less energy consumption than recent semiconductors. This paper calculates the dispersion relations in a bilayer graphene structure at finite temperatures using the random-phase approximation. The numerical results show that as temperature increases from zero, the plasmon frequency decreases slightly near the Dirac points and then increases noticeably. In large wave vector regions, the plasmon frequency behaves as an increasing function of temperature. The contribution of carrier density to plasmon frequency in the bilayer graphene system diminishes when temperature effects are taken into account. We observed that temperature significantly affects the dispersion relations in bilayer graphene systems; therefore, this factor should not be neglected in efforts to improve models or in comparisons with experimental results. |
| format | Article |
| id | doaj-art-44bb20c3f0ca48ae9a5677c848de6d11 |
| institution | Kabale University |
| issn | 0866-787X |
| language | English |
| publishDate | 2021-07-01 |
| publisher | Dalat University |
| record_format | Article |
| series | Tạp chí Khoa học Đại học Đà Lạt |
| spelling | doaj-art-44bb20c3f0ca48ae9a5677c848de6d112025-02-02T23:31:55ZengDalat UniversityTạp chí Khoa học Đại học Đà Lạt0866-787X2021-07-01354410.37569/DalatUniversity.11.4.882(2021)634DISPERSION RELATIONS IN BILAYER GRAPHENE AT FINITE TEMPERATURENguyen Van Men0An Giang University - Vietnam National University Ho Chi Minh CityIt is well-known that material technology is considered as one of the scientific fields attracting a lot of attention from scientists. Recently, graphene, a perfect two-dimensional structure, has attracted a large amount of interest from researchers due to its unique properties and possible applications in a variety of technological fields. The dispersion relations in graphene demonstrate that this material can be used to create plasmonic devices with potentially more features and less energy consumption than recent semiconductors. This paper calculates the dispersion relations in a bilayer graphene structure at finite temperatures using the random-phase approximation. The numerical results show that as temperature increases from zero, the plasmon frequency decreases slightly near the Dirac points and then increases noticeably. In large wave vector regions, the plasmon frequency behaves as an increasing function of temperature. The contribution of carrier density to plasmon frequency in the bilayer graphene system diminishes when temperature effects are taken into account. We observed that temperature significantly affects the dispersion relations in bilayer graphene systems; therefore, this factor should not be neglected in efforts to improve models or in comparisons with experimental results.https://tckh.dlu.edu.vn/index.php/tckhdhdl/article/view/882bilayer graphenedispersion relationsdynamical dielectric functionfinite temperaturerandom-phase approximation. |
| spellingShingle | Nguyen Van Men DISPERSION RELATIONS IN BILAYER GRAPHENE AT FINITE TEMPERATURE Tạp chí Khoa học Đại học Đà Lạt bilayer graphene dispersion relations dynamical dielectric function finite temperature random-phase approximation. |
| title | DISPERSION RELATIONS IN BILAYER GRAPHENE AT FINITE TEMPERATURE |
| title_full | DISPERSION RELATIONS IN BILAYER GRAPHENE AT FINITE TEMPERATURE |
| title_fullStr | DISPERSION RELATIONS IN BILAYER GRAPHENE AT FINITE TEMPERATURE |
| title_full_unstemmed | DISPERSION RELATIONS IN BILAYER GRAPHENE AT FINITE TEMPERATURE |
| title_short | DISPERSION RELATIONS IN BILAYER GRAPHENE AT FINITE TEMPERATURE |
| title_sort | dispersion relations in bilayer graphene at finite temperature |
| topic | bilayer graphene dispersion relations dynamical dielectric function finite temperature random-phase approximation. |
| url | https://tckh.dlu.edu.vn/index.php/tckhdhdl/article/view/882 |
| work_keys_str_mv | AT nguyenvanmen dispersionrelationsinbilayergrapheneatfinitetemperature |