Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.097404
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Important features in the spectral and temporal photoluminescence excitation of single nitrogen-vacancy (NV) centers in diamond are reported at conditions relevant for quantum applications. Bidirectional switching occurs between the neutral (NV0) and negatively charged (NV-) states. Luminescence of NV- is most efficiently triggered at a wavelength of 575 nm which ensures optimum excitation and recharging of NV0. The dark state of NV- is identified as NV0. A narrow resonance is observed in the excitation spectra at 521 nm, which mediates efficient conversion to NV0.
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