Coherence of Nitrogen-Vacancy Electronic Spin Ensembles in Diamond

Details Coherence of Nitrogen-Vacancy Electronic Spin Ensembles in Diamond Coherence of Nitrogen-Vacancy Electronic Spin Ensembles in Diamond

2010-06-22

arxiv.org/abs/1006.4219v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures; v2 minor corrections

Scientific paper

10.1103/PhysRevB.82.201201

We present an experimental and theoretical study of electronic spin decoherence in ensembles of nitrogen-vacancy (NV) color centers in bulk high-purity diamond at room temperature. Under appropriate conditions, we find ensemble NV spin coherence times (T_2) comparable to that of single NVs, with T_2 > 600 microseconds for a sample with natural abundance of 13C and paramagnetic impurity density ~10^15 cm^(-3). We also observe a sharp decrease of the coherence time with misalignment of the static magnetic field relative to the NV electronic spin axis, consistent with theoretical modeling of NV coupling to a 13C nuclear spin bath. The long coherence times and increased signal-to-noise provided by room-temperature NV ensembles will aid many applications of NV centers in precision magnetometry and quantum information.

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