Expérimental
In recent years, carbon nano-emitters like nanotubes, graphene quantum dots, and nanoribbons have emerged as promising platforms for quantum photonics, particularly in quantum communication and information processing. Their optical properties are versatile, thanks to control over the working wavelength via quantum confinement. Methods such as chemical grafting of color centers in carbon nanotubes and chemically synthesized graphene dots have made these emitters more robust, with room-temperature single-photon emission demonstrated. However, their performance is often hindered by environmental interactions, leading to dephasing and spectral diffusion. A promising solution is encapsulating nano-emitters in van der Waals heterostructures, which provide an atomically clean environment without needing ultra-vacuum conditions. Conductive 2D materials like graphene also allow for gating, reducing spectral diffusion by screening electrostatic fluctuations. The research group has developed a cryogenic micro-photoluminescence setup, incorporating super-resolution techniques to map single-photon emitters with sub-wavelength precision (~20 nm). Quasi-resonant excitation spectroscopy further explores confined excited states. This internship aims to deepen understanding of these heterostructures’ photophysics using advanced spectroscopy, with potential exploration of inter-layer excitons that could lead to new physics phenomena and applications like non-classical light sources.