Strain-tunable Single Photon Sources in WSe2 Monolayers

Abstract

The appearance of single photon sources in atomically thin semiconductors holds great promises for the development of a flexible and ultra-compact quantum technology, in which elastic strain engineering can be used to tailor their emission properties. Here, we show a compact and hybrid 2D-semiconductor-piezoelectric device that allows for controlling the energy of single photons emitted by quantum emitters localized in wrinkled WSe2 monolayers. We demonstrate that strain fields exerted by the piezoelectric device can be used to tune the energy of localized excitons in WSe2 up to 18 meV in a reversible manner, while leaving the single photon purity unaffected over a wide range. Interestingly, we find that the magnitude and in particular the sign of the energy shift as a function of stress is emitter dependent. With the help of finite element simulations we suggest a simple model that explains our experimental observations and, furthermore, discloses that the type of strain (tensile or compressive) experienced by the quantum emitters strongly depends on their localization across the wrinkles. Our findings are of strong relevance for the practical implementation of single photon devices based on two-dimensional materials as well as for understanding the effects of strain on their emission properties.

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Cited by in corpus (19)

• Fabrication methods for integrating 2D materials
• Strain-tunable orbital, spin-orbit, and optical properties of monolayer transition-metal dichalcogenides
• Exciton-Photonics: From Fundamental Science to Applications
• 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
• Photoluminescence imaging of single photon emitters within nanoscale strain profiles in monolayer WSe${}_2$
• Microheater actuators as a versatile platform for strain engineering in 2D materials
• Ultra-bright single photon source based on an atomically thin material
• Tailoring Polarization in WSe${}_2$ Quantum Emitters through Deterministic Strain Engineering
• Strain control of exciton and trion spin-valley dynamics in monolayer transition metal dichalcogenides
• Dynamic Tuning of Single-Photon Emission in Monolayer WSe2 via Localized Strain Engineering
• Creation and Microscopic Origins of Single-Photon Emitters in Transition Metal Dichalcogenides and Hexagonal Boron Nitride
• The Effect of Mechanical Strain on Lithium Staging in Graphene
• Curvature-enhanced localised emission from dark states in wrinkled monolayer WSe2 at room temperature
• High-purity and stable single-photon emission in bilayer WSe${}_2$ via phonon-assisted excitation
• First-principles computational methods for quantum defects in two-dimensional materials: A perspective
• Mode-center Placement of Monolayer WS${}_2$ in a Photonic Polymer Waveguide
• Angular Emission Properties of Strained Transition-Metal Dichalcogenides
• Measurements of absolute bandgap deformation-potentials of optically-bright bilayer WSe${}_2$