Optically active quantum dots in monolayer WSe2.

By A. Srivastava, Meinrad Sidler, A. Allain, D. Lembke, Andras Kis, A. Imamoğlu. Nature Nanotechnology, 2014

787 citations recorded by the source corpus.

Semiconductor quantum dots have emerged as promising candidates for the implementation of quantum information processing, because they allow for a quantum interface between stationary spin qubits and propagating single photons. In the meantime, transition-metal dichalcogenide monolayers have moved to the forefront of solid-state research due to their unique band structure featuring a large bandgap with degenerate valleys and non-zero Berry curvature. Here, we report the observation of zero-dimensional anharmonic quantum emitters, which we refer to as quantum dots, in monolayer tungsten diselenide, with an energy that is 20-100 meV lower than that of two-dimensional excitons. Photon antibunching in second-order photon correlations unequivocally demonstrates the zero-dimensional anharmonic nature of these quantum emitters. The strong anisotropic magnetic response of the spatially localized emission peaks strongly indicates that radiative recombination stems from localized excitons that inherit their electronic properties from the host transition-metal dichalcogenide. The large ∼1 meV zero-field splitting shows that the quantum dots have singlet ground states and an anisotropic confinement that is most probably induced by impurities or defects. The possibility of achieving electrical control in van der Waals heterostructures and to exploit the spin-valley degree of freedom renders transition-metal-dichalcogenide quantum dots interesting for quantum information processing.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/976e69b8dc51bd40a1dc6ea1047773d6ea76ac8c

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In Atomic and Molecular Physics, and Optics

1. Zhenhua Ni
2. Dirk Englund
3. M. Toth
4. E. Malic
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In Materials Chemistry

1. Zhangting Wu
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7. Igor Aharonovich

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.”
• Exciton physics and device application of two-dimensional transition metal dichalcogenide semiconductors (2018, background): “More recently, the role of dark exciton states has become a major field of research [25-27], as well as the emission of quantum light from localized states [28-32].”