Room-temperature valley-selective emission in Si-MoSe2 heterostructures enabled by high-quality-factor chiroptical cavities

Pan, Feng; Li, Xin; Johnson, Amalya C.; Dhuey, Scott; Saunders, Ashley; Hu, Meng-Xia; Dixon, Jefferson P.; Dagli, Sahil; Lau, Sze-Cheung; Weng, Tingting; Chen, Chih-Yi; Zeng, Jun-Hao; Apte, Rajas; Heinz, Tony F.; Liu, Fang; Deng, Zi-Lan; Dionne, Jennifer A.

doi:10.1038/s41467-025-66502-4

Title: Room-temperature valley-selective emission in Si-MoSe₂ heterostructures enabled by high-quality-factor chiroptical cavities

Journal Article · Sat Nov 29 00:00:00 UTC 2025 · Nature Communications

DOI: https://doi.org/10.1038/s41467-025-66502-4 · OSTI ID:3024330

^[1]; Li, Xin ^[2];

^[1]; Dhuey, Scott ^[3];

^[1]; Hu, Meng-Xia ^[2]; Dixon, Jefferson P. ^[1]; Dagli, Sahil ^[1]; Lau, Sze-Cheung ^[1]; Weng, Tingting ^[4];

^[1]; Zeng, Jun-Hao ^[2];

^[1]; Heinz, Tony F. ^[5];

^[1];

^[2];

^[1]

Stanford Univ., CA (United States)
Jinan Univ., Guangzhou, Guangdong (China)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry
Marvell Technology, Inc., Santa Clara, CA (United States)
Stanford Univ., CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Transition metal dichalcogenides possess valley pseudospin, enabling coupling between photon spin and electron spin for classical and quantum information processing. However, rapid valley-dephasing processes have impeded the development of scalable, high-performance valleytronic devices operating at room temperature. Here we demonstrate that a chiral resonant metasurface can enable room-temperature valley-selective emission in MoSe₂ monolayers independent of excitation polarization. This platform provides circular eigen-polarization states with a high quality factor (Q-factor) and strong chiral near-field enhancement. The fabricated Si chiral metasurfaces exhibit chiroptical resonances with Q-factors up to 450 at visible wavelengths. We reveal degrees of circular polarization (DOP) reaching a record high of 0.5 at room temperature. Our measurements show that the high DOP can be attributed to the significantly increased chiroptical local density of states, which enhances valley-specific radiative transition rates by a factor of ~13. Our work could facilitate the development of ultracompact chiral classical and quantum light sources.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: Defense Advanced Research Projects Agency (DARPA); National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515; SC0021984; SC0026181

OSTI ID:: 3024330

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 17; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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