Spin-coherence characterization of boron vacancy defects in hexagonal boron nitride with broadband microwave pulses
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914520899780608 |
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| author | Nakamura, Yuki Iwasaki, Takuya Nakaharai, Shu Ogawa, Shinichi Morita, Yukinori Watanabe, Kenji Taniguchi, Takashi Sasaki, Kento Kobayashi, Kensuke |
| author_facet | Nakamura, Yuki Iwasaki, Takuya Nakaharai, Shu Ogawa, Shinichi Morita, Yukinori Watanabe, Kenji Taniguchi, Takashi Sasaki, Kento Kobayashi, Kensuke |
| contents | Negatively charged boron vacancy (VB-) defects in hexagonal boron nitride (hBN) are promising for nanoscale-proximity quantum sensing. To evaluate their performance, it is important to characterize the spin coherence times T2* and T2. In this study, we realized sub-GHz Rabi oscillations of VB- using an isotopically enriched hBN thin film directly stamped onto a narrow gold wire. Using these strong microwave pulses, we performed Ramsey interference and Hahn echo measurements. The Ramsey interference signal showed Gaussian-like decay, yielding T2* = 13.8 ns. The Hahn echo measurement gave T2 = 108.7 ns and a stretch factor of α= 1.25. These results experimentally clarify the spin coherence properties of VB- and provide an effective method for evaluating the coherence of spin defects in van der Waals thin films with broad resonance linewidths. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_27843 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Spin-coherence characterization of boron vacancy defects in hexagonal boron nitride with broadband microwave pulses Nakamura, Yuki Iwasaki, Takuya Nakaharai, Shu Ogawa, Shinichi Morita, Yukinori Watanabe, Kenji Taniguchi, Takashi Sasaki, Kento Kobayashi, Kensuke Mesoscale and Nanoscale Physics Negatively charged boron vacancy (VB-) defects in hexagonal boron nitride (hBN) are promising for nanoscale-proximity quantum sensing. To evaluate their performance, it is important to characterize the spin coherence times T2* and T2. In this study, we realized sub-GHz Rabi oscillations of VB- using an isotopically enriched hBN thin film directly stamped onto a narrow gold wire. Using these strong microwave pulses, we performed Ramsey interference and Hahn echo measurements. The Ramsey interference signal showed Gaussian-like decay, yielding T2* = 13.8 ns. The Hahn echo measurement gave T2 = 108.7 ns and a stretch factor of α= 1.25. These results experimentally clarify the spin coherence properties of VB- and provide an effective method for evaluating the coherence of spin defects in van der Waals thin films with broad resonance linewidths. |
| title | Spin-coherence characterization of boron vacancy defects in hexagonal boron nitride with broadband microwave pulses |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2604.27843 |