Epitaxial CaWO4 thin films with 183W reduced to 1.2% abundance were grown, showing 214 MHz PL linewidth and single Er3+ ion emission in nanophotonic devices.
Small Laue oscillations around the CaWO4 substrate (004) peak may originate from local crystal distortions due to deviations of the thin film lattice from the bulk
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Isotopically enriched epitaxial CaWO$_{4}$ thin films for Er$^{3+}$ spin-photon quantum interfaces
Epitaxial CaWO4 thin films with 183W reduced to 1.2% abundance were grown, showing 214 MHz PL linewidth and single Er3+ ion emission in nanophotonic devices.