Systematic investigation of dynamic nuclear polarization with boron vacancy in hexagonal boron nitride

Yuki Nakamura; Shunsuke Nishimura; Takuya Iwasaki; Shu Nakaharai; Shinichi Ogawa; Yukinori Morita; Kenji Watanabe; Takashi Taniguchi; Kento Sasaki; Kensuke Kobayashi

doi:10.1103/physrevb.111.195404

論文 Systematic investigation of dynamic nuclear polarization with boron vacancy in hexagonal boron nitride

Yuki Nakamura ; Shunsuke Nishimura ; Takuya Iwasaki (National Institute for Materials Science) ; Shu Nakaharai (National Institute for Materials Science) ; Shinichi Ogawa ; Yukinori Morita ; Kenji Watanabe (National Institute for Materials Science) ; Takashi Taniguchi (National Institute for Materials Science) ; Kento Sasaki ; Kensuke Kobayashi

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Yuki Nakamura, Shunsuke Nishimura, Takuya Iwasaki, Shu Nakaharai, Shinichi Ogawa, Yukinori Morita, Kenji Watanabe, Takashi Taniguchi, Kento Sasaki, Kensuke Kobayashi. Systematic investigation of dynamic nuclear polarization with boron vacancy in hexagonal boron nitride. Physical Review B. 2025, 111 (19), 195404. https://doi.org/10.1103/physrevb.111.195404

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Dynamic nuclear polarization (DNP) using the boron vacancy (V−B) in hexagonal boron nitride (hBN) has gained increasing attention. Understanding this DNP requires systematically investigating the optically detected magnetic resonance (ODMR) spectra and developing a model that quantitatively describes its behavior. Here, we measure the ODMR spectra of V−B in h10B15N across a wide range of magnetic fields, including the ground state level anti-crossing (GSLAC), and compare them with the results of the Lindblad-based simulation that considers a single electron spin and three neighboring 15N nuclear spins. We find the nuclear spin polarization estimated from the Lorentzian fitting of the ODMR spectra consistent with the simulation. Furthermore, our simulation successfully reproduces the experimentally obtained ODMR spectra, including the vicinity of GSLAC. By comparing these results in detail, we show that the conventional method of estimating polarization is qualitative but not quantitative. Finally, we show that symmetry-induced mechanisms of V−B limit the maximum polarization. Our study is an essential step toward a quantitative understanding of DNP using defects in hBN, and it paves the way for its quantum applications.

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