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A double-edged sword in two-dimensional material science and technology is an optically forbidden dark exciton. On the one hand, it is fascinating for condensed matter physics, quantum information processing, and optoelectronics due to its long lifetime. On the other hand, it is notorious for being optically inaccessible from both excitation and detection standpoints. Here, we provide an efficient and low-loss solution to the dilemma by reintroducing photonics bound states in the continuum (BICs) to manipulate dark excitons in the momentum space. In a monolayer tungsten diselenide under normal incidence, we observed a giant enhancement with an enhancement factor of ~3,100 for dark excitons enabled by transverse magnetic BICs with intrinsic out-of-plane electric fields. By further employing widely tunable Friedrich-Wintgen BICs, we demonstrated highly directional emission from the dark excitons with a divergence angle of merely 7 degrees. We found that the directional emission is coherent at room temperature, unambiguously shown in polarization analyses and interference measurements. Therefore, the BICs reintroduced as a momentum-space photonic environment could be an intriguing platform to reshape and redefine light-matter interactions in nearby quantum materials, such as low-dimensional materials, otherwise challenging or even impossible to achieve.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Dark exciton, photonics bound states, directional emission

刊行年月日: 2022-11-14

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Communications (ISSN: 20411723) vol. 13 issue. 1 6916

研究助成金:

• Texas A and M University
• Texas A&M University | Texas A and M Engineering Experiment Station, Texas A and M University
• National Science Foundation DMR-2103842
• MEXT | Japan Society for the Promotion of Science JPMXP0112101001, 19H05790, 20H00354, 21H05233

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41467-022-34740-5

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更新時刻: 2025-02-28 08:30:11 +0900

MDRでの公開時刻: 2025-02-28 08:30:12 +0900