Abstract
Coherent quantum control and resonance fluorescence of few-level quantum systems is integral for quantum technologies. Here we perform resonance and near-resonance excitation of three-dimensionally confined excitons in monolayer WSe2 to reveal near-ideal single-photon fluorescence with count rates up to 3 MHz. Using high-resolution photoluminescence excitation spectroscopy of the localized excitons, we uncover a weakly fluorescent exciton state ∼5 meV blue shifted from the ground-state exciton, providing important information to unravel the precise nature of quantum states. Successful demonstration of resonance fluorescence paves the way to probe the localized exciton coherence in two-dimensional semiconductors.
Highlights
Near-resonance optical excitation of quantized matter underpins the field of quantum photonics
The experiments have revealed that optical absorption into the BLUE-SHIFTED EXCITON (BS-X) state quickly relaxes into the ground state exciton state, from which it can emit pure single photons
We currently do not understand the nature or origin of BS-X, but we exclude coupling to the lowest-energy discrete phonon mode [33]
Summary
Near-resonance optical excitation of quantized matter underpins the field of quantum photonics. Localized excitons that exhibit substantially reduced linewidths compared to 2D-X have been discovered in twodimensional materials [21,22,23,24,25,26,27,28] Besides their basic magneto-optical properties, these quantum emitters have yet to be explored in detail. (iii) Spectral lines without measurable FSS that do not exhibit any or extremely small Zeeman splitting even for Bext 9 T [22] These emitters are typically linearly polarized, and the degree of linear polarization is unchanged with a magnetic field. We investigate emitters in categories (ii) and (iii)
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