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

Emanuil S. Yanev, Thomas P. Darlington, Sophia A. Ladyzhets, Matthew C. Strasbourg, Chiara Trovatello, Song Liu, Daniel A. Rhodes, Kobi Hall, Aditya Sinha, Nicholas J. Borys (), James C. Hone () and P. James Schuck ()
Additional contact information
Emanuil S. Yanev: Columbia University
Thomas P. Darlington: Columbia University
Sophia A. Ladyzhets: Columbia University
Matthew C. Strasbourg: Montana State University
Chiara Trovatello: Columbia University
Song Liu: Columbia University
Daniel A. Rhodes: Columbia University
Kobi Hall: Columbia University
Aditya Sinha: Columbia University
Nicholas J. Borys: Montana State University
James C. Hone: Columbia University
P. James Schuck: Columbia University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: 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

Date: 2024
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DOI: 10.1038/s41467-024-45936-2

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