Optical dynamic nuclear polarization of $^{13}$C spins in diamond at a low field with multi-tone microwave irradiation

• URL: http://arxiv.org/abs/2110.14850v1
• Date: Thu, 28 Oct 2021 02:14:34 GMT
• Title: Optical dynamic nuclear polarization of $^{13}$C spins in diamond at a low field with multi-tone microwave irradiation
• Authors: Vladimir Vladimirovish Kavtanyuk, Hyun Joon Lee, Sangwon Oh, Keunhong Jeong, Jeong Hyun Shim
• Abstract summary: Triplet structures corresponding to $14$N hyperfine splitting were clearly observed in the spectrum of $13$C polarization. By simultaneously irradiating three microwave frequencies matching to the peaks of the triplet, we achieved a $13$C bulk polarization of 0.113 %.
• Score: 1.0499611180329804
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Most of dynamic nuclear polarization (DNP) has been requiring helium cryogenics and strong magnetic fields for a high degree of polarization. In this work, we instead demonstrate an optical hyperpolarization of naturally abundant $^{13}$C nuclei in a diamond crystal at a low magnetic field and an ambient temperature. It exploits continuous irradiations of pump laser for polarizing electron spins of nitrogen vacancy centers and microwave for transferring the induced polarization to $^{13}$C nuclear spins. Triplet structures corresponding to $^{14}$N hyperfine splitting were clearly observed in the spectrum of $^{13}$C polarization. The powers of microwave irradiation and pump laser were optimized. By simultaneously irradiating three microwave frequencies matching to the peaks of the triplet, we achieved a $^{13}$C bulk polarization of 0.113 %, leading to an enhancement of about a factor of 90,000 over the thermal polarization at 17.6 mT. We believe that the multi-tone irradiation can be universally adopted to further enhance the $^{13}$C polarization at a low magnetic field.

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