Negatively charged boron vacancy center in diamond
Negatively charged boron vacancy center in diamond
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DOI：
10.1103/physrevb.105.165201
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发表时间：
2022-04
影响因子：
3.7
通讯作者：
T. Umeda;K. Watanabe;H. Hara;H. Sumiya;S. Onoda;A. Uedono;I. Chuprina;P. Siyushev;F. Jelezko;J. Wrachtrup;J. Isoya
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作者：
T. Umeda;K. Watanabe;H. Hara;H. Sumiya;S. Onoda;A. Uedono;I. Chuprina;P. Siyushev;F. Jelezko;J. Wrachtrup;J. Isoya
金刚石中的杂质-空位复合物是一个有吸引力的自旋缺陷家族，并且已经成为量子应用的有前途的平台。虽然硼最容易结合到金刚石中，但在负电荷状态下的硼-空位复合物却无法在实验中观察到。这个中心在理论上被预测为另一个有前途的自旋量子比特。在这项工作中，我们实验观察到的电子顺磁共振（EPR）谱确定为在合成金刚石通过费米能级调谐。指纹，如自旋多重对称性，零场分裂（MHz），除了和超精细（HF）的相互作用，已被证实。此外，光泵自旋极化已观察到3.0-3.6 eV的激发。然而，与中心不同的是，即使在低温下，光致发光以及光学检测到的磁共振也没有得到证实。我们推测，Jahn-Teller不稳定性在三重激发态的中心和导致不同的光学性质。
Impurity-vacancy complexes in diamond are an attractive family of spin defects since, andhave emerged as promising platforms for quantum applications. Although boron is most easily incorporated into diamond, a boron-vacancy complex in the negative charge statehas eluded experimental observation. This center was theoretically predicted as another promising spin qubit. In this work, we experimentally observed an electron paramagnetic resonance (EPR) spectrum identified asin synthetic diamonds via a Fermi-level tuning. Fingerprints ofsuch as the spin multiplicity ofsymmetry, and the zero-field splitting (MHz), in addition toandhyperfine (HF) interactions, have been confirmed. Moreover, optically pumped spin polarization has been observed with 3.0–3.6 eV excitation. However, unlike thecenter, the photoluminescence as well as optically detected magnetic resonance fromhave not been confirmed even at low temperatures. We speculate that the Jahn-Teller instability in the triplet excited states of theandcenters results in different optical properties.