Highly Polarized Single-Photon Emission from Localized Excitons in a WSe2/CrSBr Heterostructure
Varghese Alapatt (Universidad de Valencia (ICMol))
Francisco Marques-Moros (Universidad de Valencia (ICMol))
Carla Boix-Constant (Universidad de Valencia (ICMol))
Samuel Mañas-Valero (Universidad de Valencia (ICMol), Kavli institute of nanoscience Delft, TU Delft - QN/vanderSarlab)
Kirill I. Bolotin (Freie Universität Berlin)
Josep Canet-Ferrer (University of Valencia)
Eugenio Coronado (Universidad de Valencia (ICMol))
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Abstract
Single-photon emitters (SPEs) are crucial in quantum communication and information processing. In 2D transition metal dichalcogenides (TMDs), SPEs are realized through inhomogeneous strain, while in combination with 2D magnets, a high spontaneous out-of-plane magnetization can be induced due to proximity effects. Here, an alternative is proposed that consists of suspending a TMD monolayer (WSe2) on a few-layer antiferromagnet (CrSBr) with in-plane magnetic ordering. The resulting heterostructure exhibits localization centers at lower energies than expected. Among them, a bright SPE with a high degree of polarization selection is identified. This suffers a clear energy shift driven by an in-plane magnetic field, and interestingly, this shift is correlated with the metamagnetic transition of CrSBr, suggesting a new kind of proximity-type effect. Unlike regular SPEs in WSe2 (sensitive to out-of-plane magnetic fields), our SPE demonstrates sensitivity to both in-plane and out-of-plane magnetic fields. The added tunability at significantly lower fields offers a promising direction for developing magnetically responsive quantum emitters, paving the way for more practical applications in quantum technologies.
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