Spin coherence and 14N ESEEM effects of nitrogen-vacancy centers in diamond with X-band pulsed ESR
- Princeton Univ., NJ (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Ilmenau Univ. of Technology (Germany)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Pulsed ESR experiments are reported for ensembles of negatively-charged nitrogen-vacancy centers (NV - ) in diamonds at X-band magnetic fields (280–400 mT) and low temperatures (2–70 K). The NV - centers in synthetic type IIa diamonds (nitrogen impurity concentration < 1 ppm) are prepared with bulk concentrations of 2 • 10 13 cm -3 to 4• 10 14 cm -3 by high-energy electron irradiation and subsequent annealing. We find that a proper post-radiation anneal (1000°C for 60 min) is very important to repair the radiation damage and to recover long electron spin coherence times for NV - s. After the annealing, spin coherence times of T 2 = 0.74ms at 5 K are achieved, being only limited by 13 C nuclear spectral diffusion in natural abundance diamonds. By measuring the temperature dependence of T 2 in the under-annealed diamonds (900°C) we directly extract the density (10 14 -16 cm -3 ) and activation energy (2.5 meV) of unannealed defects responsible for the faster NV - decoherence. At X-band magnetic fields, strong electron spin echo envelope modulation (ESEEM) is observed originating from the central 14 N nucleus, and we extract accurate 14 N nuclear hypefine and quadrupole tensors. In addition, the ESEEM effects from two proximal 13 C sites (second-nearest neighbor and fourth-nearest neighbor) are resolved and the respective 13 C hyperfine coupling constants are extracted.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1379707
- Journal Information:
- Diamond and Related Materials, Vol. 72, Issue C; ISSN 0925-9635
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Colour centre generation in diamond for quantum technologies
|
journal | November 2019 |
Observation of an environmentally insensitive solid-state spin defect in diamond
|
journal | July 2018 |
Similar Records
Quantifying selective alignment of ensemble nitrogen-vacancy centers in (111) diamond
Highly tunable formation of nitrogen-vacancy centers via ion implantation