Journal
PHYSICAL REVIEW B
Volume 86, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.045204
Keywords
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Funding
- ARC [DP0771676]
- Australian Research Council [DP0771676] Funding Source: Australian Research Council
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The photoluminescence of the negatively charged nitrogen-vacancy (NV-) center displays anomalous saturation behavior at high excitation pulse energies. Where the luminescence is expected to approach a maximum value asymptotically, we have found that it instead drops by as much as a factor of two. In this report, we present evidence that these effects are caused by optical spin depolarization of the NV- center. We show that the presence of an external magnetic field results in a marked decrease in the anomalous character of the NV- centers' luminescence and demonstrate that low-energy pulses applied after a strong depolarizing pulse can repolarize the spin of the center. We also offer a model and derive important parameters describing dynamics in the NV center and its interaction with light, which quantitatively explain all the observations.
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