4.8 Article

Imaging Charged Exciton Localization in van der Waals WSe2/MoSe2 Heterobilayers

期刊

JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 12, 期 43, 页码 10589-10594

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c03093

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资金

  1. U.S. National Science Foundation [CMMI-1930769]
  2. United States Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences Biosciences

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The study visualized excitons in WSe2/MoSe2 heterobilayers using tip-enhanced photoluminescence, revealing strong confinement of charged excitons in individual nanoscopic bubbles. The localized trion emission spectra show sub-10-nm spatial variations, originating from atomic-scale potential energy fluctuations. These findings demonstrate the potential for confining charged exciton complexes in electrically tunable locations, opening up new opportunities for probing many-body exciton physics and exploring sites for strong exciton localization leading to quantum emission.
Exciton localization in transition-metal dichalcogenide monolayers is behind a variety of interesting phenomena and applications, including broad-spectrum solar cells and single-photon emissions. Strain fields at the periphery of topographically distinct features such as nanoscopic bubbles were recently associated with localized charge-neutral excitons. Here, we use tip-enhanced photoluminescence (PL) to visualize excitons in WSe2/MoSe2 heterobilayers (HBL). We find strong optical emission from charged excitons, particularly positively charged trions, in HBL supported by interlayer charge transfer. Our results reveal strong trion confinement, with a localization length scale comparable to the trion size, at the apex region inside individual nanoscopic bubbles. Nano-PL mapping also shows sub-10-nm spatial variations in the localized trion emission spectra, which stem from atomic-scale potential energy fluctuations. These findings demonstrate the possibility of confining charged exciton complexes that are electrically tunable, opening up further opportunities to probe many-body exciton physics and to explore additional possible sites for strong exciton localization that can lead to quantum emission.

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