Carrier density and light helicity dependence of photocurrent in mono- and bilayer graphene
Helicity-dependent photocurrent in monolayer graphene has been the subject of intense debate, and was recently ascribed to photon drag and circular photogalvanic effects. Unlike inversion symmetric monolayer graphene with no band gap, the most stable case of two-layer graphene, AB-stacked bilayer gr...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/140193 |
| _version_ | 1826112041779200000 |
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| author | Qian, X. Cao, Bingchen Wang, Zilong Shen, Xiaonan Soci, Cesare Eginligil, Mustafa Yu, Ting |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Qian, X. Cao, Bingchen Wang, Zilong Shen, Xiaonan Soci, Cesare Eginligil, Mustafa Yu, Ting |
| author_sort | Qian, X. |
| collection | NTU |
| description | Helicity-dependent photocurrent in monolayer graphene has been the subject of intense debate, and was recently ascribed to photon drag and circular photogalvanic effects. Unlike inversion symmetric monolayer graphene with no band gap, the most stable case of two-layer graphene, AB-stacked bilayer graphene, has broken inversion symmetry and can have a band gap upon electrical gating. Here we report the experimental determination of the photocurrent response of mono- and bilayer graphene as a function of light polarization, as well as carrier density and polarity. The mono- and bilayer graphene data show qualitative features in common with the photocurrent contribution that is expected to arise from the photon drag effect. On the other hand, the photocurrent due to the circular photogalvanic effect in bilayer (monolayer) graphene has asymmetric (symmetric) dependence on carrier density, which is attributed to particle-hole asymmetry. |
| first_indexed | 2024-10-01T03:00:45Z |
| format | Journal Article |
| id | ntu-10356/140193 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:00:45Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1401932020-05-27T05:31:02Z Carrier density and light helicity dependence of photocurrent in mono- and bilayer graphene Qian, X. Cao, Bingchen Wang, Zilong Shen, Xiaonan Soci, Cesare Eginligil, Mustafa Yu, Ting School of Physical and Mathematical Sciences Engineering::Materials Condensed Matter (Graphene) Materials Science Helicity-dependent photocurrent in monolayer graphene has been the subject of intense debate, and was recently ascribed to photon drag and circular photogalvanic effects. Unlike inversion symmetric monolayer graphene with no band gap, the most stable case of two-layer graphene, AB-stacked bilayer graphene, has broken inversion symmetry and can have a band gap upon electrical gating. Here we report the experimental determination of the photocurrent response of mono- and bilayer graphene as a function of light polarization, as well as carrier density and polarity. The mono- and bilayer graphene data show qualitative features in common with the photocurrent contribution that is expected to arise from the photon drag effect. On the other hand, the photocurrent due to the circular photogalvanic effect in bilayer (monolayer) graphene has asymmetric (symmetric) dependence on carrier density, which is attributed to particle-hole asymmetry. MOE (Min. of Education, S’pore) 2020-05-27T05:31:02Z 2020-05-27T05:31:02Z 2018 Journal Article Qian, X., Cao, B., Wang, Z., Shen, X., Soci, C., Eginligil, M., & Yu, T. (2018). Carrier density and light helicity dependence of photocurrent in mono- and bilayer graphene. Semiconductor Science and Technology, 33(11), 114008-. doi:10.1088/1361-6641/aae2f1 0268-1242 https://hdl.handle.net/10356/140193 10.1088/1361-6641/aae2f1 2-s2.0-85055342437 11 33 en Semiconductor Science and Technology © 2018 IOP Publishing Ltd. All rights reserved |
| spellingShingle | Engineering::Materials Condensed Matter (Graphene) Materials Science Qian, X. Cao, Bingchen Wang, Zilong Shen, Xiaonan Soci, Cesare Eginligil, Mustafa Yu, Ting Carrier density and light helicity dependence of photocurrent in mono- and bilayer graphene |
| title | Carrier density and light helicity dependence of photocurrent in mono- and bilayer graphene |
| title_full | Carrier density and light helicity dependence of photocurrent in mono- and bilayer graphene |
| title_fullStr | Carrier density and light helicity dependence of photocurrent in mono- and bilayer graphene |
| title_full_unstemmed | Carrier density and light helicity dependence of photocurrent in mono- and bilayer graphene |
| title_short | Carrier density and light helicity dependence of photocurrent in mono- and bilayer graphene |
| title_sort | carrier density and light helicity dependence of photocurrent in mono and bilayer graphene |
| topic | Engineering::Materials Condensed Matter (Graphene) Materials Science |
| url | https://hdl.handle.net/10356/140193 |
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