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Title: Spatial variations of valley splitting in monolayer transition metal dichalcogenide
Authors: Zou, Chenji
Zhang, Hongbo
Chen, Yu
Feng, Shun
Wu, Lishu
Zhang, Jing
Yu, Ting
Shang, Jingzhi
Cong, Chunxiao
Keywords: Science::Physics
Issue Date: 2020
Source: 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
Project: RG199/17
Journal: InfoMat
Abstract: 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.
ISSN: 2567-3165
DOI: 10.1002/inf2.12050
Rights: © 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.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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