Journal
PHYSICAL REVIEW B
Volume 98, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.98.235140
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Funding
- Princeton Center for Complex Materials, an NSF MRSEC [DMR-1420541]
- NSF EFRI ACQUIRE Program [1640959]
- New National Excellence Program of the Ministry of Human Capacities [NKP-17-3-III]
- EU Commission (ASTERIQS) [820394]
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Color centers in diamond are a promising platform for quantum technologies, and understanding their interactions with the environment is crucial for these applications. We report a study of spin-lattice relaxation (T-1) of the neutral charge state of the silicon vacancy center in diamond. Above 20 K, T-1 decreases rapidly with a temperature-dependence characteristic of an Orbach process and is strongly anisotropic with respect to magnetic-field orientation. As the angle of the magnetic field is rotated relative to the symmetry axis of the defect, T-1 is reduced by over three orders of magnitude. The electron spin coherence time (T-2) follows the same temperature dependence but is drastically shorter than T-1. We propose that these observations result from phonon-mediated transitions to a low-lying excited state that are spin conserving when the magnetic field is aligned with the defect axis, and we discuss likely candidates for this excited state.
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