arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1906.05903cond-mat.mes-hallphysics.optics
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范德华嵌入顺磁缺陷中的单自旋共振

Single spin resonance in a van der Waals embedded paramagnetic defect

Nathan Chejanovsky, Amlan Mukherjee, Youngwook Kim, Andrej Denisenko, Amit Finkler, Takashi Taniguchi, Kenji Watanabe, Durga Bhaktavatsala Rao Dasari, Jurgen H.… 展开作者

Nathan Chejanovsky, Amlan Mukherjee, Youngwook Kim, Andrej Denisenko, Amit Finkler, Takashi Taniguchi, Kenji Watanabe, Durga Bhaktavatsala Rao Dasari, Jurgen H. Smet, Jörg Wrachtrup

摘要:

自旋构成了一组量子对象,形成了现代量子技术中的关键资源。二维范德华材料是研究纳米尺度磁现象的重要材料。然而,在2D系统中分离奇异顺磁自旋是具有挑战性的。我们在这里报告的量子发射源嵌入在hextraponicboron nitride(h-BN)表现出光磁共振(ODMR)。我们提取接近2的各向同性$g$因子,并推导出零场分裂($\leq$ 4 MHz)的上限。光致发光(PL)的行为下的温度循环使用不同的激发,分配可能的零声子线(ZPLs)/声子边带(PSB)的发射峰,兼容的h-BN的声子态密度,表明它们的内在本质。窄且不均匀的加宽ODMR线与文献中已知的单原子空位缺陷线显著不同。我们得到了约10 MHz的超精细耦合。它的角度依赖性表明在平面外的$π$ -轨道中的未成对电子,可能源自额外的替代碳杂质或其他低质量原子。我们确定自旋弛豫时间$T_1$为17 $μ$ s左右。

英文摘要:

Spins constitute a group of quantum objects forming a key resource in modern quantum technology. Two-dimensional (2D) van der Waals materials are of fundamental interest for studying nanoscale magnetic phenomena. However, isolating singular paramagnetic spins in 2D systems is challenging. We report here on a quantum emitting source embedded within hexgonal boron nitride (h-BN) exhibiting optical magnetic resonance (ODMR). We extract an isotropic $g$ factor close to 2 and derive an upper bound for a zero field splitting (ZFS) ($\leq$ 4 MHz). Photoluminescence (PL) behavior under temperature cycling using different excitations is presented, assigning probable zero phonon lines (ZPLs) / phonon side band (PSBs) to emission peaks, compatible with h-BN's phonon density of states, indicating their intrinsic nature. Narrow and inhomogeneous broadened ODMR lines differ significantly from monoatomic vacancy defect lines known in literature. We derive a hyperfine coupling of around 10 MHz. Its angular dependence indicates an unpaired electron in an out-of-plane $π$-orbital, probably originating from an additional substitutional carbon impurity or other low mass atom. We determine the spin relaxation time $T_1$ to be around 17 $μ$s.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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