期刊
NEW JOURNAL OF PHYSICS
卷 24, 期 3, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1367-2630/ac58b6
关键词
nitrogen vacancy center; chemical vapor deposition; electron-beam irradiation; magnetometry; quantum sensing; sensitivity
资金
- German federal ministry for education and research Bundesministerium fur Bildung und Forschung (BMBF) [13XP5063]
- ARC Centre of Excellence for Quantum Computation and Communication Technology [CE170100012]
- Australian Government Research Training Program Scholarship
- Asian Office of Aerospace Research and Development [FA2386-18-1-4056]
This study systematically investigates the formation and properties of NV centers in chemical vapor deposition diamonds, optimizing NV concentration and charge states through adjustments of nitrogen flow and electron irradiation. It provides a pathway for improving the sensitivity of NV-doped CVD diamonds.
The nitrogen-vacancy (NV) center in diamond is a promising quantum system for magnetometry applications exhibiting optical readout of minute energy shifts in its spin sub-levels. Key material requirements for NV ensembles are a high NV- concentration, a long spin coherence time and a stable charge state. However, these are interdependent and can be difficult to optimize during diamond growth and subsequent NV creation. In this work, we systematically investigate the NV center formation and properties in bulk chemical vapor deposition (CVD) diamond. The nitrogen flow during growth is varied by over four orders of magnitude, resulting in a broad range of single substitutional nitrogen concentrations of 0.2-20 parts per million. For a fixed nitrogen concentration, we optimize electron-irradiation fluences with two different accelerated electron energies, and we study defect formation via optical characterizations. We discuss a general approach to determine the optimal irradiation conditions, for which an enhanced NV concentration and an optimum of NV charge states can both be satisfied. We achieve spin-spin coherence times T (2) ranging from 45.5 to 549 mu s for CVD diamonds containing 168 to 1 parts per billion NV- centers, respectively. This study shows a pathway to engineer properties of NV-doped CVD diamonds for improved sensitivity.
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