A strongly interacting, two-dimensional, dipolar spin ensemble in (111)-oriented diamond
arxiv(2024)
摘要
Systems of spins with strong dipolar interactions and controlled
dimensionality enable new explorations in quantum sensing and simulation. In
this work, we investigate the creation of strong dipolar interactions in a
two-dimensional ensemble of nitrogen-vacancy (NV) centers generated via
plasma-enhanced chemical vapor deposition (PECVD) on (111)-oriented diamond
substrates. We find that diamond growth on the (111) plane yields high
incorporation of spins, both nitrogen and NV centers, where the density of the
latter is tunable via the miscut of the diamond substrate. Our process allows
us to form dense, preferentially aligned, 2D NV ensembles with
volume-normalized AC sensitivity down to η_AC = 810 pT um^3/2
Hz^-1/2. Furthermore, we show that (111) affords maximally positive dipolar
interactions amongst a 2D NV ensemble, which is crucial for leveraging
dipolar-driven entanglement schemes and exploring new interacting spin physics.
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