0000000000535139

AUTHOR

Guillem Ballesteros-garcia

showing 2 related works from this author

Resonant laser spectroscopy of localized excitons in monolayer WSe_2

2016

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-dime…

Semiconductor luminescence equationsCondensed Matter::OtherChemistryExciton02 engineering and technologyCondensed Matter::Mesoscopic Systems and Quantum Hall Effect021001 nanoscience & nanotechnology01 natural sciencesAtomic and Molecular Physics and Optics3. Good healthElectronic Optical and Magnetic MaterialsQuantum technologyCondensed Matter::Materials ScienceResonance fluorescence0103 physical sciencesPhotoluminescence excitationAtomic physicsQuantum-optical spectroscopy010306 general physics0210 nano-technologySpectroscopyBiexcitonOptica
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Nanoscale strain-engineering and optics of quantum emitters in a two-dimensional semiconductor

2017

We present deterministic fabrication of a two-dimensional lattice of quantum emitters in an atomically thin semiconductor. Resonant laser spectroscopy of these emitters reveals localized exciton states that exhibit stable, bright and high-purity single photon emission.

0301 basic medicineSemiconductor luminescence equationsMaterials scienceFabricationbusiness.industryExcitonPhysics::Optics02 engineering and technology021001 nanoscience & nanotechnology03 medical and health sciences030104 developmental biologyStrain engineeringSemiconductorPhysics::Accelerator PhysicsOptoelectronics0210 nano-technologySpectroscopybusinessQuantumElectron-beam lithographyConference on Lasers and Electro-Optics
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