Yu Ming He;Genevieve Clark;John R. Schaibley;Yu He;Ming Cheng Chen;Yu Jia Wei;Xing Ding;Qiang Zhang;Wang Yao;Xiaodong Xu;Chao Yang Lu;建伟 潘
University of Science and Technology of China;Synergetic Innovation Centre in Quantum Information and Quantum Physics;University of Washington;The University of Hong Kong
发表时间:2015-6-6
期 刊:Nature Nanotechnology
语 言:English
U R L: http://www.scopus.com/inward/record.url?scp=84930467391&partnerID=8YFLogxK
Single quantum emitters (SQEs) are at the heart of quantum optics and photonic quantum-information technologies. To date, all the demonstrated solid-state single-photon sources are confined to one-dimensional (1D; ref. 3) or 3D materials. Here, we report a new class of SQEs based on excitons that are spatially localized by defects in 2D tungsten-diselenide (WSe2) monolayers. The optical emission from these SQEs shows narrow linewidths of ∼130μeV, about two orders of magnitude smaller than those of delocalized valley excitons. Second-order correlation measurements revealed a strong photon antibunching, which unambiguously established the single-photon nature of the emission. The SQE emission shows two non-degenerate transitions, which are cross-linearly polarized. We assign this fine structure to two excitonic eigenmodes whose degeneracy is lifted by a large ∼0.71meV coupling, probably because of the electron-hole exchange interaction in the presence of anisotropy. Magneto-optical measurements also reveal an exciton g factor of ∼8.7, several times larger than those of delocalized valley excitons. In addition to their fundamental importance, establishing new SQEs in 2D quantum materials could give rise to practical advantages in quantum-information processing, such as an efficient photon extraction and a high integratability and scalability.
化合物
工程与材料科学
物理与天文学
Scopus度量
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2006 | |||
2007 | 4.749 | 2.69 | |
2008 | 8.006 | 5.382 | |
2009 | 11.107 | 6.032 | |
2010 | 11.876 | 7.01 | |
2011 | 45.4 | 14.582 | 8.308 |
2012 | 44.4 | 15.706 | 7.505 |
2013 | 49.7 | 16.688 | 7.714 |
2014 | 49.7 | 17.177 | 8.001 |
2015 | 52.6 | 18.842 | 7.728 |
2016 | 55.9 | 18.916 | 7.523 |
2017 | 65.1 | 20.612 | 7.911 |
2018 | 61.1 | 17.049 | 7.318 |
2019 | 59.4 | 15.555 | 6.81 |
2020 | 57.2 | ||
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