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Journal Article
Optical Dynamic Nuclear Polarization of 13C Spins in Diamond at a Low Field with Multi-Tone Microwave Irradiation
- Authors
- Vladimir V. Kavtanyuk, Hyun Joon Lee, Sangwon Oh, Keunhong Jeong, Jeong Hyun Shim
- Issue Date
- 2022-03
- Citation
- Molecules, v.27, no.5, pp.1-11
- ISSN
- 1420-3049
- Publisher
- MDPI
- Language
- English
- Type
- Journal Article
- Abstract
- Majority of dynamic nuclear polarization (DNP) experiments have been requiring helium cryogenics and strong magnetic fields for a high degree of nuclear polarization. In this work, we instead demonstrate an optical hyperpolarization of naturally abundant13C nuclei in a diamond crystal at a low magnetic field and the room temperature. It exploits continuous laser irradiation for polarizing electronic spins of nitrogen vacancy centers and microwave irradiation for transferring the electronic polarization to13C nuclear spins. We have studied the dependence of13C polarization on laser and microwave powers. For the first time, a triplet structure corresponding to the14N hyperfine splitting has been observed in the13C polarization spectrum. By simultaneously exciting three microwave frequencies at the peaks of the triplet, we have achieved13C bulk polarization of 0.113 %, leading to an enhancement of 90,000 over the thermal polarization at 17.6 mT. We believe that the multi-tone irradiation can be extended to further enhance the13C polarization at a low magnetic field.
- KSP Keywords
- Diamond crystal, Dynamic Nuclear Polarization, High degree, Hyperfine splitting, Laser irradiation, Low magnetic field, Low-field, Microwave frequencies, Microwave irradiation(MWI), Nuclear spins, Polarization spectrum
This work is distributed under the term of Creative Commons License (CCL)
(CC BY)
(CC BY)
