Physics – Condensed Matter – Materials Science
Scientific paper
2011-12-27
Physics
Condensed Matter
Materials Science
5 pages, 3 figures, and 3 pages of supplemental material with additional figures
Scientific paper
We present an experimental study of the longitudinal electron-spin relaxation time (T1) of negatively charged nitrogen-vacancy (NV) ensembles in diamond. T1 was studied as a function of temperature from 5 to 475 K and magnetic field from 0 to 630 G for several samples with various NV and nitrogen concentrations. Our studies reveal three processes responsible for T1 relaxation. Above room temperature, a two-phonon Raman process dominates, and below, we observe an Orbach-type process with an activation energy, 73(4) meV, which closely matches the local vibrational modes of the NV center. At yet lower temperatures, sample dependent cross relaxation processes dominate, resulting in temperature independent values of T1, from ms to minutes. The value of T1 in this limit depends sensitively on magnetic field and can be tuned by more than an order of magnitude.
Acosta Monica Vazquez
Budker Dmitry
Chemerisov Sergey
Jarmola Andrey
Jensen Kristan
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