Programmable nanowrinkle-induced room-temperature exciton localization in monolayer WSe2

Yanev, Emanuil S.; Darlington, Thomas P.; Ladyzhets, Sophia A.; Strasbourg, Matthew C.; Trovatello, Chiara; Liu, Song; Rhodes, Daniel A.; Hall, Kobi; Sinha, Aditya; Borys, Nicholas J.; Hone, James C.; Schuck, P. James

doi:10.1038/s41467-024-45936-2

Title: Programmable nanowrinkle-induced room-temperature exciton localization in monolayer WSe2

Journal Article · 19 February 2024 · Nature Communications

DOI: https://doi.org/10.1038/s41467-024-45936-2 · OSTI ID:2309769

;

; Trovatello, Chiara; Liu, Song;

;

; Sinha, Aditya;

;

Abstract Localized states in two-dimensional (2D) transition metal dichalcogenides (TMDCs) have been the subject of intense study, driven by potential applications in quantum information science. Despite the rapidly growing knowledge surrounding these emitters, their microscopic nature is still not fully understood, limiting their production and application. Motivated by this challenge, and by recent theoretical and experimental evidence showing that nanowrinkles generate strain-localized room-temperature emitters, we demonstrate a method to intentionally induce wrinkles with collections of stressors, showing that long-range wrinkle direction and position are controllable with patterned array design. Nano-photoluminescence (nano-PL) imaging combined with detailed strain modeling based on measured wrinkle topography establishes a correlation between wrinkle properties, particularly shear strain, and localized exciton emission. Beyond the array-induced wrinkles, nano-PL spatial maps further reveal that the strain environment around individual stressors is heterogeneous due to the presence of fine wrinkles that are less deterministic. At cryogenic temperatures, antibunched emission is observed, confirming that the nanocone-induced strain is sufficiently large for the formation of quantum emitters. At 300 K, detailed nanoscale hyperspectral images uncover a wide range of low-energy emission peaks originating from the fine wrinkles, and show that the states can be tightly confined to regions <10 nm, even in ambient conditions. These results establish a promising potential route towards realizing room temperature quantum emission in 2D TMDC systems.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0019443

OSTI ID:: 2309769

Alternate ID(s):: OSTI ID: 2472141

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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