Date of Degree
Gustavo E. Lopez
Condensed Matter Physics | Optics | Quantum Physics
NV Center, Sensing, Charge Dynamics, Cryogenic
Individual quantum systems in semiconductors are currently the most sought-after platform for applications in quantum science. Most notably, the nitrogen-vacancy (NV) center in diamond features a defect deep within the electronic bandgap, making it amenable for precise manipulation to help pave the way to perform fundamental quantum physics experimentation. The NV center also offers long coherence times and versatile spin-dependent fluorescent properties, making it an ideal candidate for a nanoscale magnetometer. Furthermore, multi-color excitation offers deterministic charge state manipulation. While ambient operation has been key to their appeal, bringing NVs to cryogenic conditions opens new opportunities for alternate forms of control schemes and phenomena. This dissertation discusses experimental work and the theoretical analysis of surface dynamics on NV-based AFM probes in proximity to a superconductor. A brief introduction on the experimental infrastructure is reviewed. Time-resolved experiments on the NV’s single electron spin are analyzed to lend insight into the interdependence between magnetic and electric field noise sources affecting the surface of a diamond. This thesis also examines the use of the NV’s cryogenic optical transitions in single crystal diamond for sub-diffraction charge control to implement long-term, multiplexed, and rewritable data storage. Lastly, experimentations on the NV’s spin-dependent optical transitions as a means of detection sensitivity enhancement are investigated, with the goal to ultimately revert to applications in the context of nanoscale metrology.
Monge, Richard G., "Dynamics of Spin and Charge of Color Centers in Diamond under Cryogenic Conditions" (2023). CUNY Academic Works.