High-purity and stable single-photon emission in bilayer WSe${}_2$ via phonon-assisted excitation

Abstract

The excitation scheme is essential for single-photon sources, as it governs exciton preparation, decay dynamics, and the spectral diffusion of emitted photons. While phonon-assisted excitation has shown promise in other quantum emitter platforms, its proper implementation and systematic comparison with alternative excitation schemes have not yet been demonstrated in transition metal dichalcogenide (TMD) quantum emitters. Here, we investigate the impact of various optical excitation strategies on the single-photon emission properties of bilayer WSe${}_2$ quantum emitters. Based on our theoretical predictions for the exciton preparation fidelity, we compare excitation via the longitudinal acoustic and breathing phonon modes to conventional above-band and near-resonance excitations. Under acoustic phonon-assisted excitation, we achieve narrow single-photon emission with a reduced spectral diffusion of 0.0129 nm, a 1.8-fold improvement over above-band excitation. Additionally, excitation through breathing-phonon mode yields a high purity of $0.947\pm 0.079$ and reduces the decay time by over an order of magnitude, reaching $(1.33\pm 0.04)$ns. Our comprehensive study demonstrates the crucial role of phonon-assisted excitation in optimizing the performance of WSe${}_2$-based quantum emitters, providing valuable insights for the development of single-photon sources for quantum photonics applications.

References in corpus (35)

• Evolution of Electronic Structure in Atomically Thin Sheets of WS2 and WSe2
• Implementation strategies in phonopy and phono3py
• Recent Progress of the Computational 2D Materials Database (C2DB)
• A bright and fast source of coherent single photons
• On-demand semiconductor single-photon source with near-unity indistinguishability
• Towards optimal single-photon sources from polarized microcavities
• 12-photon entanglement and scalable scattershot boson sampling with optimal entangled-photon pairs from parametric down-conversion
• Efficient non-Markovian quantum dynamics using time-evolving matrix product operators
• Irradiation of Nanostrained Monolayer WSe${}_2$ for Site-Controlled Single-Photon Emission up to 150 K
• GPAW: An open Python package for electronic-structure calculations
• Interference of Single Photons from Two Separate Semiconductor Quantum Dots
• Quantum dots for photonic quantum information technology
• Localized inter-valley defect excitons as single-photon emitters in WSe${}_2$
• Bright Polarized Single-Photon Source Based on a Linear Dipole
• Strain-tunable Single Photon Sources in WSe2 Monolayers
• The role of momentum-dark excitons in the elementary optical response of bilayer WSe${}_2$
• Site-Controlled Telecom Single-Photon Emitters in Atomically-thin MoTe2
• Proposed robust and high-fidelity preparation of excitons and biexcitons in semiconductor quantum dots making active use of phonons
• Purcell-enhanced single photon source based on a deterministically placed WSe${}_2$ monolayer quantum dot in a circular Bragg grating cavity
• Atomically-thin Single-photon Sources for Quantum Communication
• Reproducibility of high-performance quantum dot single-photon sources
• Swing-up of quantum emitter population using detuned pulses
• Coupling single photons from discrete quantum emitters in WSe${}_2$ to lithographically defined plasmonic slot-waveguides
• Coupling emission from single localized defects in 2D semiconductor to surface plasmon polaritons
• Highly indistinguishable single photons from incoherently and coherently excited GaAs quantum dots
• SUPER Scheme in Action: Experimental Demonstration of Red-detuned Excitation of a Quantum Dot
• Microcavity enhanced single photon emission from two-dimensional WSe2
• Emergent properties of van der Waals bilayers revealed by computational stacking
• Ultra-bright single photon source based on an atomically thin material
• Single Photon Emission from Deep Level Defects in Monolayer WSe2
• Substrate engineering for high quality emission of free and localized excitons from atomic monolayers in hybrid architectures
• Tailoring Polarization in WSe${}_2$ Quantum Emitters through Deterministic Strain Engineering
• OQuPy: A Python package to efficiently simulate non-Markovian open quantum systems with process tensors
• Exciton fine structure splitting and linearly polarized emission in strained transition-metal dichalcogenide monolayers
• Single-photon emitters in WSe${}_2$: Critical role of phonons on excitation schemes and indistinguishability

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• Measurements of absolute bandgap deformation-potentials of optically-bright bilayer WSe${}_2$