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.
Institut de Science et d’Ingénierie Supramoléculaires (ISIS, UMR7006), Université de Strasbourg（斯特拉斯堡大学超分子科学与工程学院）；Institut für Physik, Johannes Gutenberg Universität Mainz（美因茨约翰内斯·古腾堡大学物理研究所）；Department of Physics, Texas AM University（德克萨斯农工大学物理系）；Max Planck Institute for the Physics of Complex Systems（马克斯·普朗克复杂系统物理研究所）；Max Planck Institute for Chemical Physics of Solids（马克斯·普朗克固体化学物理研究所）；Institute of Physics, Czech Academy of Sciences（捷克科学院物理研究所）；Department of Physics, The State University of New York at Buffalo（纽约州立大学布法罗分校物理系）
Visualizing Chiral Edge Modes in Twisted Cuprate Superconductors via Scanning-Probe Quantum Sensing
Georgia Institute of Technology（佐治亚理工学院）；Harvard University（哈佛大学）；National Institute for Materials Science（国立材料研究所）；Brookhaven National Laboratory（布鲁克海文国家实验室）；Argonne National Laboratory（阿贡国家实验室）
Entropic signatures of the single-impurity Kondo state
Stewart Blusson Quantum Matter Institute, University of British Columbia（不列颠哥伦比亚大学斯图尔特·布拉斯森量子物质研究所）；Department of Physics and Astronomy, University of British Columbia（不列颠哥伦比亚大学物理与天文学系）；Department of Physics and Astronomy, Purdue University（普渡大学物理与天文学系）；Microsoft Quantum（微软量子）
Self-assembled fluorescent nanodiamond layers for quantum imaging
School of Science, RMIT University（RMIT大学理学院）；National Institutes for Quantum and Radiological Science and Technology（量子辐射科学技术研究院）；Department of Materials Science, Tohoku University（东北大学材料科学系）
Anomalous Hall Effect and Perpendicular Magnetic Anisotropy in Ultrathin Ferrimagnetic NiCo$_2$O$_4$ Films
反尖晶石铁磁NiCo $_2$ O $_4$具有高磁居里温度$T_C$、高自旋极化和应变可调的磁各向异性。了解这些有趣的磁性在NiCo $_2$ O $_4$薄膜的厚度缩放限制是至关重要的，它们在纳米自旋电子应用的实施。本文报道了MgAl $_2$ O $_4$基片上外延（001）NiCo $_2$ O $_4$薄膜在室温下的非常规磁输运性质。反常的霍尔效应测量表明，对于低至1.5个晶胞（1.2 nm）的薄膜，具有强的垂直磁各向异性，而对于3个晶胞和更厚的薄膜，$T_C$保持在300 K以上。反常霍尔电导率（$σ_{xy}$）的符号变化及其与纵向电导率（$σ_{xx}$）的标度关系可以归因于杂质散射和能带本征Berry曲率之间的竞争效应，后者在厚度驱动的金属-绝缘体转变后消失。我们的研究揭示了薄膜厚度在调整电荷相关、Berry相位效应、自旋轨道相互作用和杂质散射的相对强度方面的关键作用，为设计可扩展的外延磁性隧道结和使用NiCo $_2$ O $_4$的传感器件提供了重要的材料信息。
Sensing a magnetic rare-earth surface alloy by proximity effect with an open-shell nanographene
Empa - Swiss Federal Laboratories for Materials Science and Technology（瑞士联邦材料科学与技术研究院）；Regensburg Center for Ultrafast Nanoscopy (RUN), University of Regensburg（雷根斯堡大学超快纳米科学中心）；Institute of Theoretical Physics, University of Regensburg（雷根斯堡大学理论物理研究所）；Department of Chemistry, University of Zurich（苏黎世大学化学系）；ALBA Synchrotron Light Source（阿尔巴同步辐射光源）；Department of Chemistry, Biochemistry and Pharmaceutical Sciences, University of Bern（伯尔尼大学生物化学与药学系）；Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University（查理大学数学与物理学院凝聚态物理系）
