Spin-defect characteristics of single sulfur vacancies in monolayer MoS₂

Single spin defects in 2D transition-metal dichalcogenides are natural spin-photon interfaces for quantum applications. Here we report high-field magneto-spectroscopy to B=27T from three emission lines of deterministically induced sulfur vacancies in monolayer MoS₂ [1]. The distinct valley-Zeeman splitting and the brightening of dark states necessitates spin-valley selectivity of the defect states and lifted spin-degeneracy at zero field. Comparing our results to ab-initio calculations identifies the nature of the defect luminescence. Analysis of the optical degree of circular polarization as a function of magnetic field and gate voltage reveals that the Fermi level is a parameter that enables the tunability of the emitter. These combined results show that defects in 2D semiconductors may be utilized for quantum technologies.

[1] A. Hötger et al., arXiv: 2205.10286, to appear (2022)