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Microcavity enhanced single photon emission from two-dimensional WSe2
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abstract
Atomically flat semiconducting materials such as monolayer WSe$_2$ hold great promise for novel optoelectronic devices. Recently, quantum light emission has been observed from bound excitons in exfoliated WSe$_2$. As part of developing optoelectronic devices, the control of the radiative properties of such emitters is an important step. Here we report the coupling of a bound exciton in WSe$_2$ to open microcavities. We use a range of radii of curvature in the plano-concave cavity geometry with mode volumes in the $\lambda^3$ regime, giving Purcell factors of up to 8 while increasing the photon flux five-fold. Additionally we determine the quantum efficiency of the single photon emitter to be $\eta = 0.46 \pm 0.03$. Our findings pave the way to cavity-enhanced monolayer based single photon sources for a wide range of applications in nanophotonics and quantum information technologies.
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Cited by 1 Pith paper
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Impact of phonon lifetimes on the single-photon indistinguishability in quantum emitters based on 2D materials
Finite phonon lifetimes cause pure dephasing that caps single-photon indistinguishability at about 0.3 to 0.4 for WSe2 quantum emitters coupled to 2D acoustic phonons.
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