Search results for "Quantum-optical spectroscopy"

showing 3 items of 3 documents

Absorption spectroscopy of single InAs self-assembled quantum dots

2004

Abstract Excitonic transitions of single InAs self-assembled quantum dots were directly measured at 4.2 K in an optical transmission experiment. We use the Stark effect in order to tune the exciton energy of a single quantum dot into resonance with a narrow-band laser. With this method, sharp resonances in the transmission spectra are observed. The oscillator strengths as well as the homogeneous line widths of the single-dot optical transitions are obtained. A clear saturation in the absorption is observed at modest laser powers.

Materials scienceAbsorption spectroscopyExcitonResonanceCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCondensed Matter PhysicsLaserAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic Materialslaw.inventionsymbols.namesakeStark effectQuantum dot laserlawQuantum dotsymbolsQuantum-optical spectroscopyAtomic physicsPhysica E: Low-dimensional Systems and Nanostructures
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Far-infrared laser on quantum dots created by electric-field focusing

2003

The new proposal of a far-infrared laser employing intraband transitions in the system of quantum dots is briefly described. The conditions for inversion of population for electrons in the quantum dot matrix created by an electric-field focusing in narrow GaAs/AlGaAs quantum well are discussed. The laser is planned to be pumped by periodically repeated rapid creation and destruction of the quantum dot matrix allowing for repeated filling of the dot levels with electrons from a quantum well. Some major results of the analysis of the kinetics of the electron-photon system are presented.

Quantum opticsbusiness.industryChemistryQuantum point contactCavity quantum electrodynamicsCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCondensed Matter PhysicsAtomic and Molecular Physics and OpticsSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsQuantum dotQuantum dot laserElectro-absorption modulatorOptoelectronicsElectrical and Electronic EngineeringQuantum-optical spectroscopybusinessQuantum wellMicroelectronic Engineering
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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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