Site-controlled telecom-wavelength single-photon emitters in atomically-thin MoTe2

Huan Zhao (), Michael T. Pettes, Yu Zheng and Han Htoon ()
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Huan Zhao: Los Alamos National Laboratory
Michael T. Pettes: Los Alamos National Laboratory
Yu Zheng: Los Alamos National Laboratory
Han Htoon: Los Alamos National Laboratory

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Quantum emitters (QEs) in two-dimensional transition metal dichalcogenides (2D TMDCs) have advanced to the forefront of quantum communication and transduction research. To date, QEs capable of operating in O-C telecommunication bands have not been demonstrated in TMDCs. Here we report site-controlled creation of telecom QEs emitting over the 1080 to 1550 nm telecommunication wavelength range via coupling of 2D molybdenum ditelluride (MoTe2) to strain inducing nano-pillar arrays. Hanbury Brown and Twiss experiments conducted at 10 K reveal clear photon antibunching with 90% single-photon purity. The photon antibunching can be observed up to liquid nitrogen temperature (77 K). Polarization analysis further reveals that while some QEs display cross-linearly polarized doublets with ~1 meV splitting resulting from the strain induced anisotropic exchange interaction, valley degeneracy is preserved in other QEs. Valley Zeeman splitting as well as restoring of valley symmetry in cross-polarized doublets are observed under 8 T magnetic field.

Date: 2021
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DOI: 10.1038/s41467-021-27033-w

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