Abstract
Here, we investigate the magnetic field dependent photoluminescence (PL) of a fiber-coupled diamond single crystal with a high density of nitrogen vacancy (NV) centers. Angle-dependent magnetic field sweep measurements between 0 and 111 mT were performed using an oscillating illumination combined with lock-in techniques. Besides the expected superposed PL of differently oriented NV centers, a zoo of features in the PL are found. These features can be associated with level anti-crossings and cross relaxations. In particular, PL measurements allowed us to detect auto-cross relaxation between coupled NV centers. Moreover, the PL measurements at low magnetic fields show dips suggesting an interaction of NV centers with additional spin defects. The results presented here are not only a study for NV-based fiber-coupled sensors made of diamond, but also show a way to investigate with manageable effort and purely an optical multispin interaction with at least one NV center as a constituent.
Highlights
Diamond is the host material of one of the outstanding research objects in applied quantum physics in solids in the last decade—the negatively charged nitrogen vacancy defect center (NV center)
The results presented here are a study for NV-based fibercoupled sensors made of diamond, and show a way to investigate with manageable effort and purely an optical multispin interaction with at least one NV center as a constituent
Scitation.org/journal/jap directions are tilted by an angle of about 109 relative to the magnetic field vector according to tetragonal symmetry
Summary
Diamond is the host material of one of the outstanding research objects in applied quantum physics in solids in the last decade—the negatively charged nitrogen vacancy defect center (NV center). We investigate the magnetic field dependent photoluminescence (PL) of a fiber-coupled diamond single crystal with a high density of nitrogen vacancy (NV) centers.
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