Spatial variations of valley splitting in monolayer transition metal dichalcogenide
In monolayer group‐VI transition metal dichalcogenides (TMDs), valley splitting features have received a lot of attention since it can be potentially utilized for information storing and processing. Among the known two‐dimensional (2D) TMDs, monolayer WSe2 or MoSe2 has been mostly selected for excit...
| Main Authors: | , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2021
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| Online Access: | https://hdl.handle.net/10356/146088 |
| _version_ | 1811683925359067136 |
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| author | Zou, Chenji Zhang, Hongbo Chen, Yu Feng, Shun Wu, Lishu Zhang, Jing Yu, Ting Shang, Jingzhi Cong, Chunxiao |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Zou, Chenji Zhang, Hongbo Chen, Yu Feng, Shun Wu, Lishu Zhang, Jing Yu, Ting Shang, Jingzhi Cong, Chunxiao |
| author_sort | Zou, Chenji |
| collection | NTU |
| description | In monolayer group‐VI transition metal dichalcogenides (TMDs), valley splitting features have received a lot of attention since it can be potentially utilized for information storing and processing. Among the known two‐dimensional (2D) TMDs, monolayer WSe2 or MoSe2 has been mostly selected for excitonic and valleytronic physics studies because of its sharp and well‐resolved excitonic spectral features. Meanwhile, their high optical quality leads to a tremendous desire for developing promising WSe2‐ and MoSe2‐based valleytronic devices. Toward this goal, exploring the uniformity of valley features crossing an entire piece of monolayer becomes necessary and critical. Here, we performed the systematic magneto‐photoluminescence mapping measurements on mechanically exfoliated monolayer WSe2 and observed unconventional spatial variations of valley splitting. The observed nonuniformity is attributed to the modulated doping, which is probably due to the different distributions of unintentional absorbates across the sample. Such an unexpected doping effect shows the nonnegligible influence on the valley Zeeman splitting of the trion emission (XT) while affecting that of the neutral exciton emission (X0) trivially, evidencing for the large valleytronic sensitivity of the charged exciton. This work not only enriches the understanding of the doping effect on valley splitting but also is meaningful for developing 2D valleytronics. |
| first_indexed | 2024-10-01T04:20:29Z |
| format | Journal Article |
| id | ntu-10356/146088 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:20:29Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1460882023-02-28T19:52:21Z Spatial variations of valley splitting in monolayer transition metal dichalcogenide Zou, Chenji Zhang, Hongbo Chen, Yu Feng, Shun Wu, Lishu Zhang, Jing Yu, Ting Shang, Jingzhi Cong, Chunxiao School of Physical and Mathematical Sciences Science::Physics Doping Effect Monolayer WSe 2 In monolayer group‐VI transition metal dichalcogenides (TMDs), valley splitting features have received a lot of attention since it can be potentially utilized for information storing and processing. Among the known two‐dimensional (2D) TMDs, monolayer WSe2 or MoSe2 has been mostly selected for excitonic and valleytronic physics studies because of its sharp and well‐resolved excitonic spectral features. Meanwhile, their high optical quality leads to a tremendous desire for developing promising WSe2‐ and MoSe2‐based valleytronic devices. Toward this goal, exploring the uniformity of valley features crossing an entire piece of monolayer becomes necessary and critical. Here, we performed the systematic magneto‐photoluminescence mapping measurements on mechanically exfoliated monolayer WSe2 and observed unconventional spatial variations of valley splitting. The observed nonuniformity is attributed to the modulated doping, which is probably due to the different distributions of unintentional absorbates across the sample. Such an unexpected doping effect shows the nonnegligible influence on the valley Zeeman splitting of the trion emission (XT) while affecting that of the neutral exciton emission (X0) trivially, evidencing for the large valleytronic sensitivity of the charged exciton. This work not only enriches the understanding of the doping effect on valley splitting but also is meaningful for developing 2D valleytronics. Ministry of Education (MOE) Published version National Natural Science Foundation of China, Grant/Award Numbers: 61774040, 11774170; Singapore Ministry of Education (MOE) Tier 1, Grant/Award Number: RG199/17; The Fudan University-CIOMP Joint Fund, Grant/Award Number: FC2018-002; The National Key R&D Program of China, Grant/Award Number: 2018YFA0703700; The National Young 1000 Talent Plan of China; The Shanghai Municipal Natural Science Foundation, Grant/Award Number: 16ZR1402500; The Shanghai Municipal Science and Technology Commission, Grant/Award Number: 18JC1410300. 2021-01-26T07:13:17Z 2021-01-26T07:13:17Z 2020 Journal Article Zou, C., Zhang, H., Chen, Y., Feng, S., Wu, L., Zhang, J., . . . Cong, C. (2020). Spatial variations of valley splitting in monolayer transition metal dichalcogenide. InfoMat, 2(3), 585-592. doi:10.1002/inf2.12050 2567-3165 https://hdl.handle.net/10356/146088 10.1002/inf2.12050 3 2 585 592 en RG199/17 InfoMat © 2019 The Authors. InfoMat published by John Wiley & Sons Australia, Ltd on behalf of UESTC. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. application/pdf |
| spellingShingle | Science::Physics Doping Effect Monolayer WSe 2 Zou, Chenji Zhang, Hongbo Chen, Yu Feng, Shun Wu, Lishu Zhang, Jing Yu, Ting Shang, Jingzhi Cong, Chunxiao Spatial variations of valley splitting in monolayer transition metal dichalcogenide |
| title | Spatial variations of valley splitting in monolayer transition metal dichalcogenide |
| title_full | Spatial variations of valley splitting in monolayer transition metal dichalcogenide |
| title_fullStr | Spatial variations of valley splitting in monolayer transition metal dichalcogenide |
| title_full_unstemmed | Spatial variations of valley splitting in monolayer transition metal dichalcogenide |
| title_short | Spatial variations of valley splitting in monolayer transition metal dichalcogenide |
| title_sort | spatial variations of valley splitting in monolayer transition metal dichalcogenide |
| topic | Science::Physics Doping Effect Monolayer WSe 2 |
| url | https://hdl.handle.net/10356/146088 |
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