Controlling Valley-Specific Light Emission from Monolayer MoS2 with Achiral Dielectric Metasurfaces

Liu, Yin; Lau, Sze Cheung; Cheng, Wen-Hui; Johnson, Amalya; Li, Qitong; Simmerman, Emma; Karni, Ouri; Hu, Jack; Liu, Fang; Brongersma, Mark L.; Heinz, Tony F.; Dionne, Jennifer A.

doi:10.1021/acs.nanolett.3c01630

Title: Controlling Valley-Specific Light Emission from Monolayer MoS₂ with Achiral Dielectric Metasurfaces

Journal Article · Thu Jun 22 00:00:00 EDT 2023 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.3c01630· OSTI ID:2000237

^[1]; Lau, Sze Cheung ^[2];

^[3]; Johnson, Amalya ^[2]; Li, Qitong ^[2]; Simmerman, Emma ^[2]; Karni, Ouri ^[4];

^[2]; Liu, Fang ^[2];

^[2]; Heinz, Tony F. ^[4];

^[2]

Stanford Univ., CA (United States); North Carolina State University, Raleigh, NC (United States)
Stanford Univ., CA (United States)
National Cheng Kung Univ., Tainan City (Taiwan)
Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Excitons in two-dimensional transition metal dichalcogenides have a valley degree of freedom that can be optically manipulated for quantum information processing. Here, we integrate MoS₂ monolayers with achiral silicon disk array metasurfaces to enhance and control valley-specific absorption and emission. Through the coupling to the metasurface electric and magnetic Mie modes, the intensity and lifetime of the emission of neutral excitons, trions, and defect bound excitons can be enhanced and shortened, respectively, while the spectral shape can be modified. Additionally, the degree of polarization (DOP) of exciton and trion emission from the valley can be symmetrically enhanced at 100 K. The DOP increase is attributed to both the metasurface-enhanced chiral absorption of light and the metasurface-enhanced exciton emission from the Purcell effect. Finally, combining Si-compatible photonic design with large-scale 2D materials integration, our work makes an important step toward on-chip valleytronic applications approaching room-temperature operation.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Photonics at Thermodynamic Limits (PTL)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation

Grant/Contract Number:: AC02-76SF00515; SC0019140; GBMF9462

OSTI ID:: 2000237

Journal Information:: Nano Letters, Vol. 23, Issue 13; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Controlling Valley-Specific Light Emission from Monolayer MoS2 with Achiral Dielectric Metasurfaces

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Title: Controlling Valley-Specific Light Emission from Monolayer MoS₂ with Achiral Dielectric Metasurfaces