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Temperature- and Magnetic-Field-Dependent Longitudinal Spin Relaxation in Nitrogen-Vacancy Ensembles in Diamond

zqyin 添加于 2012-5-12 09:57 | 1410 次阅读 | 0 个评论

作者
Jarmola A, Acosta V, Jensen K, Chemerisov S, Budker D
摘要
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; below room temperature, we observe an Orbach-type process with an activation energy of 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 milliseconds to minutes. The value of T₁ in this limit depends sensitively on the magnetic field and can be tuned by more than 1 order of magnitude.
详细资料
- 文献种类: Journal Article
- 期刊名称: Physical Review Letters
- 期刊缩写: Phys. Rev. Lett.
- 期卷页: 2012年第108卷第19期
- ISBN: 0031-9007
学科领域自然科学 » 物理学
标签

NV centers
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