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.
Highlights
Quantum emitters (QEs) in two-dimensional transition metal dichalcogenides (2D TMDCs) have advanced to the forefront of quantum communication and transduction research
We report site-controlled creation of two types of QEs using nano-pillar-based strain engineering: near-band-edge QEs covering 1080–1150 nm in mono- and few-layer MoTe2 and telecom QEs emitting in 1200–1600 nm range in multilayer MoTe2
The quantum natures of the QEs were verified by photon correlation measurements up to liquid nitrogen temperature
Summary
Quantum emitters (QEs) in two-dimensional transition metal dichalcogenides (2D TMDCs) have advanced to the forefront of quantum communication and transduction research. 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. Telecom-compatible QEs have been demonstrated in various III–V semiconductor quantum dots[5,6] and recently in functionalized carbon nanotubes[7] Several challenges such as accurate site positioning and efficient polarization control still remain for these QEs. Over the past decade, two-dimensional (2D) semiconductors have emerged as a novel platform for both fundamental research and technological applications. We report site-controlled telecom single-photon emission in MoTe2 mono- and few layers by transferring mechanically exfoliated MoTe2 thin flakes onto strain-inducing nano-pillar arrays. The valley symmetry in these QEs is restored under 8 T magnetic field
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