Spectral and spatial isolation of single WSe$_2$ quantum emitters using hexagonal boron nitride wrinkles

Kavli Affiliate: Gregory D. Fuchs

| First 5 Authors: Raphaƫl S. Daveau, Tom Vandekerckhove, Arunabh Mukherjee, Zefang Wang, Jie Shan

| Summary:

Monolayer WSe$_2$ hosts bright single-photon emitters. Because of its
compliance, monolayer WSe$_2$ conforms to patterned substrates without
breaking, thus creating the potential for large local strain, which is one
activation mechanism of its intrinsic quantum emitters. Here, we report an
approach to creating spatially and spectrally isolated quantum emitters from
WSe$_2$ monolayers with few or no detrimental sources of emission. We show that
a bilayer of hexagonal boron nitride (hBN) and WSe$_2$ placed on a
nanostructured substrate can be used to create and shape wrinkles that
communicate local strain to the WSe$_2$, thus creating quantum emitters that
are isolated from substrate features. We compare quantum emitters created
directly on top of substrate features with quantum emitters forming along
wrinkles and find that the spectra of the latter consist of mainly a single
peak and a low background fluorescence. We also discuss possible approaches to
controlling emitter position along hBN wrinkles.

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