0000000000711228
AUTHOR
Jingyan Xu
Zero-field magnetometry based on nitrogen-vacancy ensembles in diamond
Ensembles of nitrogen-vacancy (NV) centers in diamonds are widely utilized for magnetometry, magnetic-field imaging and magnetic-resonance detection. They have not been used for magnetometry at zero ambient field because Zeeman sublevels lose first-order sensitivity to magnetic fields as they are mixed due to crystal strain or electric fields. In this work, we realize a zero-field (ZF) magnetometer using polarization-selective microwave excitation in a 12C-enriched HPHT crystal sample. We employ circularly polarized microwaves to address specific transitions in the optically detected magnetic resonance and perform magnetometry with a noise floor of 250 pT/Hz^(1/2). This technique opens the …
13C and 15N NMR Detection of Metabolites via Relayed Hyperpolarization at 1 T and 1.4 T
Nuclear-spin hyperpolarization allows various magnetic-resonance applications in chemistry and medicine that are unattainable by standard methods. For such applications, parahydrogen-based hyperpolarization approaches are particularly attractive because of their technical simplicity, low cost, and ability to quickly (in seconds) produce large volumes of hyperpolarized material. Although many parahydrogen-based techniques have emerged, some of them remain unexplored due to the lack of careful optimization studies. In this work, we investigate and optimize a novel parahydrogen-induced polarization (PHIP) technique that relies on proton exchange referred to below as PHIP-relay. An INEPT (insen…