期刊
2D MATERIALS
卷 4, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/aa629d
关键词
transition metal dichalcogenides; excitons; trions; nanobubbles; single photon source; antibunching; 2D heterostructures
资金
- National Science Foundation (NSF) [DMR-1506711]
- NSF [ECCS-MRI-1531237]
- Columbia in the Center for Precision Assembly of Superstratic and Superatomic Solids [DMR-1420634]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1506711] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1531237] Funding Source: National Science Foundation
The recent discovery of exciton quantum emitters in transition metal dichalcogenides (TMDCs) has triggered renewed interest of localized excitons in low-dimensional systems. Open questions remain about the microscopic origin previously attributed to dopants and/or defects as well as strain potentials. Here we show that the quantum emitters can be deliberately induced by nanobubble formation in WSe2 and BN/WSe2 heterostructures. Correlations of atomic-force microscope and hyperspectral photoluminescence images reveal that the origin of quantum emitters and trion disorder is extrinsic and related to 10 nm tall nanobubbles and 70 nm tall wrinkles, respectively. We further demonstrate that 'hot stamping' results in the absence of 0D quantum emitters and trion disorder. The demonstrated technique is useful for advances in nanolasers and deterministic formation of cavity-QED systems in monolayer materials.
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