Many-body GW calculations predict that NV- centers in (111) nitrogen-terminated diamond must sit deeper than about 4 nm below the surface to avoid surface-induced ionization, a limit that plain DFT does not show.
A strongly interacting, two-dimensional, dipolar spin ensemble in (111)-oriented diamond
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abstract
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 $\eta_{AC}$ = 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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cond-mat.mtrl-sci 1years
2025 1verdicts
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Surface coupling of NV centers over nanoscale lengths
Many-body GW calculations predict that NV- centers in (111) nitrogen-terminated diamond must sit deeper than about 4 nm below the surface to avoid surface-induced ionization, a limit that plain DFT does not show.