Single quantum emitters in monolayer semiconductors.
By Yu-Ming He, Genevieve Clark, J. Schaibley, Yu He, Ming-Cheng Chen, Yujia Wei, X. Ding, Qiang Zhang, W. Yao, Xiaodong Xu and 2 more. Nature Nanotechnology, 2014
933 citations recorded by the source corpus.
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 ∼130 μeV, 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 ∼0.71 meV 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.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/4c769450e1017b679f8d18804f276259f82d77d7
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Citations in the corpus
- Quantum emission from hexagonal boron nitride monolayers (2015, background): “Single photon emission from two-dimensional materials has been reported [9-13], but only at cryogenic temperatures.”
- Spectroscopic investigation of defects in two-dimensional materials (2016, background): “In addition, single photon emission shows two non-degenerate transitions, which are cross-linearly polarized [86].”
- Optical properties of atomically thin transition metal dichalcogenides: observations and puzzles (2016, background): “The quantum nature of NLECs found in this material is also highlighted by a characteristic saturation of their emission intensity at high excitation power, similar to that known from the physics of twolevel systems [71, 73, 119].”