来源：ACS Publications
Optically addressable spin impurities in crystals along with device engineering provide an attractive route to realizing quantum technologies in the solid state, but reconciling disparate emitter and host material constraints for a given target application is often challenging. Rare-earth ions in two-dimensional (2D) materials could mitigate this problem given the atomic-like transitions of the emitters and the versatile nature of van der Waals systems. Here we combine ion implantation, confocal microscopy, and ab initio calculations to examine the photon emission of Er-doped WS2 flakes. Optical spectroscopy reveals narrow, long-lived photoluminescence lines in the telecom band, which we activate after low-temperature thermal annealing. Spectroscopic and polarization-selective measurements show a uniform response across the ensemble, while the fluorescence brightness remains mostly unchanged with temperature, suggesting nonradiative relaxation channels are inefficient. Our results create opportunities for novel solid state devices coupling 2D-hosted, telecom-band emitters to photonic heterostructures separately optimized for photon manipulation.
Here, we articulate confocal microscopy and density functional theory to study the telecom PL stemming from Er emitters in exfoliated WS2 flakes. Variable temperature optical spectroscopy reveals a collection of emission lines featuring subnm inhomogeneous line widths and ms-long lifetimes, as well as a high-degree of linear polarization. Using embedding techniques to properly capture the many-body nature of the ion, we derive emission spectra and polarization plots for substitutional Er3+ emitters in qualitative agreement with our observations.