NV diamond project for nEDM

Diamond;neutron electric dipole moment;Electrometry;Quantum defect;Magnetometry;Sensing;Nonlinear optics

Sharma, Sarvagya

关键词: Diamond;    neutron electric dipole moment;    Electrometry;    Quantum defect;    Magnetometry;    Sensing;    Nonlinear optics;   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/100915/SHARMA-DISSERTATION-2018.pdf?sequence=1&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

This work presents the research conducted on Nitrogen Vacancy (NV) defects in diamonds for the nEDM experiment which has an operating temperature of 0.5 K. NV defects have been investigated as metrological sensors for measuring both, electric and magnetic fields at room temperature and also at 4 K. This thesis discusses different techniques used to probe the NV centers electronic structure. The first, Optically Detected Magnetic Resonance (ODMR) allows us to probe the Zeeman and Stark induced shifts in the ground state through resonant microwave spectroscopy. This technique has helped us study and characterize the response of the NV center to electromagnetic fields. The use of the NV center ensemble as a vector field sensor is also studied using ODMR. The second technique allows us to build a sensor which also measures the ground state resonances but without the need for microwaves. Instead the quantum phenomenon of electromagnetically induced transparency (EIT) was used. This all-optical method makes diamonds containing NV centers a suitable sensor of the nEDM experiment. The driven and free spin dynamics of the NV center are also investigated in this work. Studying the evolution of the NV center spin gives us important clues about its spin bath environment and the characteristic time constants over which the NV spin states decay. These time constants set the fundamental limit of the sensitivity for measuring magnetic and electric fields.