Nuclear spin polarization and control in hexagonal boron nitride
Nuclear spin polarization and control in hexagonal boron nitride
复制标题
六方氮化硼核自旋极化及其控制
DOI：
10.1038/s41563-022-01329-8
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发表时间：
2022-08-15
期刊：
影响因子：
41.2
通讯作者：
Li, Tongcang
中科院分区：
文献类型：
--
作者：
Gao, Xingyu;Vaidya, Sumukh;Li, Tongcang
范德华材料中的电子自旋在凝聚态物理和自旋电子学的最新进展中起着至关重要的作用。然而，范德华材料中的核自旋仍然是一种未开发的量子资源。本文报道了室温下范德华材料中核自旋的光偏振和相干控制。我们利用六方氮化硼中带负电荷的硼空位（V-B(-)）自旋缺陷来极化附近的氮核自旋。我们观察到在V-B（-）缺陷的激发态反交叉处核自旋的Rabi频率比孤立核大350倍，并证明了核自旋的快速相干控制。此外，我们检测到强电子介导的核自旋耦合比直接核自旋偶极耦合大5个数量级，从而实现多量子位操作。我们的工作为量子信息科学与技术中范德华材料中核自旋的操纵开辟了新的途径。
Electron spins in van der Waals materials are playing a crucial role in recent advances in condensed-matter physics and spintronics. However, nuclear spins in van der Waals materials remain an unexplored quantum resource. Here we report optical polarization and coherent control of nuclear spins in a van der Waals material at room temperature. We use negatively charged boron vacancy (V-B(-)) spin defects in hexagonal boron nitride to polarize nearby nitrogen nuclear spins. We observe the Rabi frequency of nuclear spins at the excited-state level anti-crossing of V-B(-) defects to be 350 times larger than that of an isolated nucleus, and demonstrate fast coherent control of nuclear spins. Further, we detect strong electron-mediated nuclear-nuclear spin coupling that is five orders of magnitude larger than the direct nuclear-spin dipolar coupling, enabling multi-qubit operations. Our work opens new avenues for the manipulation of nuclear spins in van der Waals materials for quantum information science and technology.