COULOMB DRAG RESISTIVITY IN DOUBLE-LAYER GRAPHENE: INHOMOGENEITY EFFECTS
We investigate Coulomb drag resistivity in a double-layer system consisting of two parallel monolayer graphene sheets. In calculations, we employ the random-phase approximation to determine the polarizability functions of the graphene layers and the frequency-dependent dielectric function of the st...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Dalat University
2024-09-01
|
| Series: | Tạp chí Khoa học Đại học Đà Lạt |
| Subjects: | |
| Online Access: | https://tckh.dlu.edu.vn/index.php/tckhdhdl/article/view/1283 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1823857045425618944 |
|---|---|
| author | Manh Tien Nguyen Van Men Nguyen |
| author_facet | Manh Tien Nguyen Van Men Nguyen |
| author_sort | Manh Tien Nguyen |
| collection | DOAJ |
| description |
We investigate Coulomb drag resistivity in a double-layer system consisting of two parallel monolayer graphene sheets. In calculations, we employ the random-phase approximation to determine the polarizability functions of the graphene layers and the frequency-dependent dielectric function of the structure, taking into account inhomogeneity effects of the background dielectric. Our numerical calculations reveal that Coulomb drag resistivity in double-layer graphene systems steadily increases with increasing temperature but quickly decreases as the interlayer separation increases. The drag resistivity between the two layers in the case of an inhomogeneous background dielectric is substantially larger than that in the case of a homogeneous one. In addition, both the value and the imbalance in carrier density in the layers lead to noticeable changes in Coulomb drag resistivity in the system. Our study results are useful in graphene-based structure applications.
|
| format | Article |
| id | doaj-art-30c96967168140b7bec1b4336dc2d5ad |
| institution | Kabale University |
| issn | 0866-787X |
| language | English |
| publishDate | 2024-09-01 |
| publisher | Dalat University |
| record_format | Article |
| series | Tạp chí Khoa học Đại học Đà Lạt |
| spelling | doaj-art-30c96967168140b7bec1b4336dc2d5ad2025-02-12T01:00:48ZengDalat UniversityTạp chí Khoa học Đại học Đà Lạt0866-787X2024-09-01143S10.37569/DalatUniversity.14.3S.1283(2024)COULOMB DRAG RESISTIVITY IN DOUBLE-LAYER GRAPHENE: INHOMOGENEITY EFFECTSManh Tien Nguyen0https://orcid.org/0009-0007-3546-0567Van Men Nguyen1https://orcid.org/0000-0001-5928-2469Can Tho UniversityAn Giang University We investigate Coulomb drag resistivity in a double-layer system consisting of two parallel monolayer graphene sheets. In calculations, we employ the random-phase approximation to determine the polarizability functions of the graphene layers and the frequency-dependent dielectric function of the structure, taking into account inhomogeneity effects of the background dielectric. Our numerical calculations reveal that Coulomb drag resistivity in double-layer graphene systems steadily increases with increasing temperature but quickly decreases as the interlayer separation increases. The drag resistivity between the two layers in the case of an inhomogeneous background dielectric is substantially larger than that in the case of a homogeneous one. In addition, both the value and the imbalance in carrier density in the layers lead to noticeable changes in Coulomb drag resistivity in the system. Our study results are useful in graphene-based structure applications. https://tckh.dlu.edu.vn/index.php/tckhdhdl/article/view/1283Coulomb drag resistivityDouble-layer grapheneMonolayer grapheneRandom-phase approximationTemperature effects. |
| spellingShingle | Manh Tien Nguyen Van Men Nguyen COULOMB DRAG RESISTIVITY IN DOUBLE-LAYER GRAPHENE: INHOMOGENEITY EFFECTS Tạp chí Khoa học Đại học Đà Lạt Coulomb drag resistivity Double-layer graphene Monolayer graphene Random-phase approximation Temperature effects. |
| title | COULOMB DRAG RESISTIVITY IN DOUBLE-LAYER GRAPHENE: INHOMOGENEITY EFFECTS |
| title_full | COULOMB DRAG RESISTIVITY IN DOUBLE-LAYER GRAPHENE: INHOMOGENEITY EFFECTS |
| title_fullStr | COULOMB DRAG RESISTIVITY IN DOUBLE-LAYER GRAPHENE: INHOMOGENEITY EFFECTS |
| title_full_unstemmed | COULOMB DRAG RESISTIVITY IN DOUBLE-LAYER GRAPHENE: INHOMOGENEITY EFFECTS |
| title_short | COULOMB DRAG RESISTIVITY IN DOUBLE-LAYER GRAPHENE: INHOMOGENEITY EFFECTS |
| title_sort | coulomb drag resistivity in double layer graphene inhomogeneity effects |
| topic | Coulomb drag resistivity Double-layer graphene Monolayer graphene Random-phase approximation Temperature effects. |
| url | https://tckh.dlu.edu.vn/index.php/tckhdhdl/article/view/1283 |
| work_keys_str_mv | AT manhtiennguyen coulombdragresistivityindoublelayergrapheneinhomogeneityeffects AT vanmennguyen coulombdragresistivityindoublelayergrapheneinhomogeneityeffects |