Nanocavity Clock Spectroscopy: Resolving Competing Exciton Dynamics in WSe2/MoSe2 Heterobilayers
SCIE
SCOPUS
- Title
- Nanocavity Clock Spectroscopy: Resolving Competing Exciton Dynamics in WSe2/MoSe2 Heterobilayers
- Authors
- May, Molly A.; Jiang, Tao; Du, Chenfeng; Park, Kyoung-Duck; Xu, Xiaodong; Belyanin, Alexey; Raschke, Markus B.
- Date Issued
- 2021-01
- Publisher
- American Chemical Society
- Abstract
- Transition-metal dichalcogenide heterostructures are an emergent platform for novel many-body states from exciton condensates to nanolasers. However, their exciton dynamics are difficult to disentangle due to multiple competing processes with time scales varying over many orders of magnitude. Using a configurable nano-optical cavity based on a plasmonic scanning probe tip, the radiative (rad) and nonradiative (nrad) relaxation of intra- and interlayer excitons is controlled. Tuning their relative rates in a WSe2/MoSe2 heterobilayer over 6 orders of magnitude in tip-enhanced photoluminescence spectroscopy reveals a cavityinduced crossover from nonradiative quenching to Purcell-enhanced radiation. Rate equation modeling with the interlayer charge transfer time as a reference clock allows for a comprehensive determination from the long interlayer exciton (IX) radiative lifetime tau(rad)(IX) = (94 +/- 27) ns to the 5 orders of Irad magnitude faster competing nonradiative lifetime tau(rad)(IX) = (0.6 +/- 0.2) ps. This approach of nanocavity clock spectroscopy is generally applicable to a wide range of excitonic systems with competing decay pathways.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/114694
- DOI
- 10.1021/acs.nanolett.0c03979
- ISSN
- 1530-6984
- Article Type
- Article
- Citation
- Nano Letters, vol. 21, no. 1, page. 522 - 528, 2021-01
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- There are no files associated with this item.
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