Gao Xingyu, Vaidya Sumukh, Li Kejun, Ju Peng, Jiang Boyang, Xu Zhujing, Allcca Andres E Llacsahuanga, Shen Kunhong, Taniguchi Takashi, Watanabe Kenji, Bhave Sunil A, Chen Yong P, Ping Yuan, Li Tongcang
Department of Physics and Astronomy, Purdue University, West Lafayette, IN, USA.
Department of Physics, University of California, Santa Cruz, CA, USA.
Nat Mater. 2022 Sep;21(9):1024-1028. doi: 10.1038/s41563-022-01329-8. Epub 2022 Aug 15.
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 ([Formula: see text]) 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 [Formula: see text] 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.
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发挥着关键作用。然而，范德华材料中的核自旋仍是一种未被探索的量子资源。在此，我们报道了室温下范德华材料中核自旋的光学极化和相干控制。我们利用六方氮化硼中带负电荷的硼空位（[公式：见原文]）自旋缺陷来极化附近的氮核自旋。我们观察到在[公式：见原文]缺陷的激发态能级反交叉处，核自旋的拉比频率比孤立原子核的拉比频率大350倍，并展示了对核自旋的快速相干控制。此外，我们检测到强的电子介导的核 - 核自旋耦合，其比直接的核自旋偶极耦合大五个数量级，从而实现多量子比特操作。我们的工作为量子信息科学与技术中操纵范德华材料中的核自旋开辟了新途径。
