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

Year: 2025

Type: article

Abstract: 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. Here, the authors create a high-quality-factor chiral metasurface that enables record-high room-temperature valley-selective emission in MoSe2 monolayers, independent of excitation polarization.

Source: Nature Communications

DOI: 10.1038/s41467-025-66502-4

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

Institutions: Stanford University, Jinan University, Lawrence Berkeley National Laboratory, Molecular Foundry, Marvell (United States), SLAC National Accelerator Laboratory, Stanford Medicine

Language: English

Topic: Metamaterials and Metasurfaces Applications

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $6,990

Funders: National Science Foundation, U.S. Department of Defense, U.S. Department of Energy, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, National Natural Science Foundation of China, Defense Advanced Research Projects Agency, Office of Science, Advanced Research Projects Agency, National Defense Science and Engineering Graduate, Multidisciplinary University Research Initiative, Basic and Applied Basic Research Foundation of Guangdong Province, Office of Naval Research, Division of Electrical, Communications and Cyber Systems, Basic Energy Sciences

OpenAlex ID: W4416820813