Abstract
We present high-resolution optically detected magnetic resonance spectroscopy on single nitrogen-vacancy (NV) center spins in diamond at and around zero magnetic field. The experimentally observed transitions depend sensitively on the interplay between the microwave (MW) probing field and the local intrinsic effective field comprising strain and electric fields, which act on the NV spin. Based on a theoretical model of the magnetic dipole transitions and the MW driving field, we extract both the strength and the direction of the transverse component of the effective field. Our results reveal that for the diamond crystal under study, strain is the dominant contribution to the effective field. Our experiments further yield a method for MW polarization analysis in a tunable, linear basis, which we demonstrate on a single NV spin. Our results are of importance to low-field quantum sensing applications using NV spins and form a relevant addition to the ever-growing toolset of spin-based quantum sensing.
Highlights
The nitrogen-vacancy (NV) center in diamond [1] has long shown promise as an excellent sensor, due to its exceptional sensitivity to external fields
Techniques operating at low magnetic fields, such as zero-field nuclear magnetic resonance (NMR) [16, 17] and low-field magnetometry [18] are especially vulnerable to these parasitic fields [19]
We presented high-resolution, low-power optically detected magnetic resonance (ODMR) spectroscopy studies on single NV defect centers in diamond to characterize their local effective field environment
Summary
The nitrogen-vacancy (NV) center in diamond [1] has long shown promise as an excellent sensor, due to its exceptional sensitivity to external fields. Techniques operating at low magnetic fields, such as zero-field nuclear magnetic resonance (NMR) [16, 17] and low-field magnetometry [18] are especially vulnerable to these parasitic fields [19] Their relevance and future prospects motivate extended studies to precisely characterize the environment surrounding NV spins. NV ensembles in type-Ib diamond were probed with microwave (MW) manipulation fields at zero magnetic field to investigate intrinsic effective fields, which represent the combined effects of strain and electric fields [19]. We use high-resolution, low-power optically detected magnetic resonance (ODMR) spectroscopy to characterize in detail the intrinsic effective fields affecting single NVs in high purity, type-IIa diamond. By comparing our theory to our experimental data, we are able to directly characterize the local strain and electric field environment and, in a separate experiment, determine the MW polarization used to drive the spin transitions
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