Journal
ACS PHOTONICS
Volume 9, Issue 8, Pages 2817-2824Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.2c00652
Keywords
exciton transport; polariton; strong light-matter coupling; Bloch surface wave; transition-metal dichalcogenides
Categories
Funding
- National Natural Science Foundation of China [91850207, 12134011]
- China National Postdoctoral Program for Innovative Talents [BX2021195]
- China Postdoctoral Science Foundation [2021M692199, 2021M702531]
- National Key R&D Program of China [2021YFA1401104, 2017YFA0303504]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB30000000]
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Researchers enhance the transport capability of excitons in layered tungsten disulfide by engineering its photonic environment, forming extended polaritonic states. These results provide a unique route for designing high-speed polaritonic devices based on 2D semiconductors.
Efficient transport of exciton in 2D semiconductors is of great importance for developing high-speed optoelectronic devices. However, excitons in layered transition-metal dichalcogenides, a class of 2D semiconductors, can only transport over a few hundred nanometers, due to the multiple collision with phonons and disorders. Here, we boost the transport capability of excitons in layered tungsten disulfide (WSe2) by engineering its photonic environment. Extended polaritonic states are formed between the flying interfacial photons and the tightly bounded excitons, with the Rabi splitting scaling with the square root of the layer number of WSe2. The light-mass polariton can travel several or even tens of micrometers, with its lifetime down to a femtosecond scale. Therefore, these results provide a unique route for designing high-speed polaritonic devices based on 2D semiconductors.
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