Electrical control of neutral and charged excitons in a monolayer semiconductor

Monolayer group-VI transition metal dichalcogenides have recently emerged as semiconducting alternatives to graphene in which the true two-dimensionality is expected to illuminate new semiconducting physics. Here we investigate excitons and trions (their singly charged counterparts), which have thus...

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Published in:Nature communications 2013-02, Vol.4 (1), p.1474-1474, Article 1474
Main Authors: Ross, Jason S., Wu, Sanfeng, Yu, Hongyi, Ghimire, Nirmal J., Jones, Aaron M., Aivazian, Grant, Yan, Jiaqiang, Mandrus, David G., Xiao, Di, Yao, Wang, Xu, Xiaodong
Format: Article
Language:English
Subjects:
639/301/119/1000
639/766/119
639/766/25
Humanities and Social Sciences
MATERIALS SCIENCE
multidisciplinary
Science
Science (multidisciplinary)
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Summary:Monolayer group-VI transition metal dichalcogenides have recently emerged as semiconducting alternatives to graphene in which the true two-dimensionality is expected to illuminate new semiconducting physics. Here we investigate excitons and trions (their singly charged counterparts), which have thus far been challenging to generate and control in the ultimate two-dimensional limit. Utilizing high-quality monolayer molybdenum diselenide, we report the unambiguous observation and electrostatic tunability of charging effects in positively charged (X + ), neutral (X o ) and negatively charged (X − ) excitons in field-effect transistors via photoluminescence. The trion charging energy is large (30 meV), enhanced by strong confinement and heavy effective masses, whereas the linewidth is narrow (5 meV) at temperatures
ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms2498