Electrical control of neutral and charged excitons in a monolayer semiconductor

Jason S. Ross, Sanfeng Wu, Hongyi Yu, Nirmal J. Ghimire, Aaron M. Jones, Grant Aivazian, Jiaqiang Yan, David G. Mandrus, Di Xiao, Wang Yao and Xiaodong Xu ()
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Jason S. Ross: University of Washington
Sanfeng Wu: University of Washington
Hongyi Yu: University of Hong Kong
Nirmal J. Ghimire: University of Tennessee
Aaron M. Jones: University of Washington
Grant Aivazian: University of Washington
Jiaqiang Yan: Oak Ridge National Laboratory
David G. Mandrus: University of Tennessee
Di Xiao: Carnegie Mellon University
Wang Yao: University of Hong Kong
Xiaodong Xu: University of Washington

Nature Communications, 2013, vol. 4, issue 1, 1-6

Abstract: Abstract 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 (Xo) 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

Date: 2013
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2498

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DOI: 10.1038/ncomms2498

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