Resonant laser spectroscopy of localized excitons in monolayer WSe2
Posted on 2017-04-26 - 19:06
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.
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Kumar, Santosh; Brotóns-Gisbert, Mauro; Al-Khuzheyri, Rima; Branny, Artur; Ballesteros-Garcia, Guillem; Sánchez-Royo, Juan F.; et al. (2016). Resonant laser spectroscopy of localized excitons in monolayer WSe2. Optica Publishing Group. Collection. https://doi.org/10.6084/m9.figshare.c.3756485.v1