Electrically driven photon emission from individual atomic defects in monolayer WS <sub>2</sub>
Bruno Schuler, Katherine A. Cochrane, Christoph Kastl, Edward S. Barnard, Edward Wong, Nicholas J. Borys, Adam M. Schwartzberg, D. Frank Ogletree, F. Javier García de Abajo, Alexander Weber-Bargioni
Abstract
bandgap. Coupling to the optical far field is mediated by tip plasmons, which transduce the excess energy into a single photon. The applied tip-sample voltage determines the transition energy. Atomically resolved emission maps of individual point defects closely resemble electronic defect orbitals, the final states of the optical transitions. Inelastic charge carrier injection into localized defect states of two-dimensional materials provides a powerful platform for electrically driven, broadly tunable, atomic-scale single-photon sources.
Topics & Concepts
Excited stateMonolayerMaterials scienceAtomic physicsQuantum tunnellingSpontaneous emissionLight emissionPhotonElectronCrystallographic defectQuantum dotCoupling (piping)Molecular physicsAtomic electron transitionCondensed matter physicsOptoelectronicsRadiative transferAtom (system on chip)Photon energyQuantumStimulated emissionPhysicsEmission spectrumElectronic structureInelastic scatteringField electron emissionQuantum point contactPhotoluminescenceElectric fieldTransition metal2D Materials and ApplicationsOrganic and Molecular Conductors ResearchMolecular Junctions and Nanostructures