Sensing chiral magnetic noise via quantum impurity relaxometry
Sensing chiral magnetic noise via quantum impurity relaxometry
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DOI：
10.1103/physrevb.102.220403
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发表时间：
2020-12-04
影响因子：
3.7
通讯作者：
Upadhyaya, Pramey
中科院分区：
文献类型：
--
作者：
Rustagi, Avinash;Bertelli, Iacopo;Upadhyaya, Pramey
我们提出了一种薄膜中磁振子的量子杂质弛豫测量理论，该理论与最近的实验显示出定量一致，而不需要迄今为止在理论模型中使用的任意比例因子。我们的理论表明，原型自旋>1/2量子杂质和磁振子之间的手性耦合在决定杂质弛豫中起着核心作用，我们在镍膜上与氮空位中心界面的实验进一步证实了这一点。随着磁体混合量子平台磁能学的进步和对退相干的理解，量子杂质自旋感知手性磁噪声的能力为探测凝聚态物质中的手性现象提供了机会。
We present a theory for quantum impurity relaxometry of magnons in thin films, exhibiting quantitative agreement with recent experiments without needing arbitrary scale factors used in theoretical models thus far. Our theory reveals that chiral coupling between prototypical spin >1/2 quantum impurities and magnons plays a central role in determining impurity relaxation, which is further corroborated by our experiments on nickel films interfaced with nitrogen-vacancy centers. Along with advancing magnonics and understanding decoherence in hybrid quantum platforms with magnets, the ability of a quantum impurity spin to sense chiral magnetic noise presents an opportunity to probe chiral phenomena in condensed matter.