Sensing the Local Magnetic Environment through Optically Active Defects in a Layered Magnetic Semiconductor
Sensing the Local Magnetic Environment through Optically Active Defects in a Layered Magnetic Semiconductor
复制标题
DOI：
10.1021/acsnano.2c07655
复制
发表时间：
2022-12-20
期刊：
影响因子：
17.1
通讯作者：
Ross, Frances M.
中科院分区：
文献类型：
--
作者：
Klein, Julian;Song, Zhigang;Ross, Frances M.
范德华（vdW）材料中的原子级缺陷是量子技术和量子传感应用的重要组成部分。层状磁性半导体CrSBr是探索光学活性缺陷的杰出候选者，因为它有一个直接的间隙，除了丰富的磁相图，包括最近假设的低温缺陷诱导的磁序。在这里，我们展示了CrSBr中的光学活性缺陷，它们是局部磁环境的探针。我们在CrSBr中观察到光谱窄（1 meV）缺陷发射，这与体磁序和额外的低温缺陷诱导磁序相关。我们在局部和非局部交换耦合效应的背景下阐明了这种磁序的起源。我们的工作建立了像CrSBr这样的vdW磁体作为光学研究与磁晶格相关的缺陷的特殊平台。我们预计，控制缺陷的产生允许直接光学访问定制复杂的磁性纹理和相。
Atomic-level defects in van der Waals (vdW) materials are essential building blocks for quantum technolo-gies and quantum sensing applications. The layered magnetic semiconductor CrSBr is an outstand i n g candidate for exploring optically active defects because of a direct gap, in addition to a rich magnetic phase diagram, including a recently hypothesized defect-induced magnetic order at low temperature. Here, we show optically active defects in CrSBr that are probes of the local magnetic environment. We observe a spectrally narrow ( 1 meV) defect emission in CrSBr t h a t is correlated with both the bulk magnetic order and an additional low-temperature, defect-induced magnetic order. We elucidate the origi n of this magnetic order in the context of local and nonlocal exchange coupling effects. Our work establishes vdW magnets like CrSBr as an exceptional platform to optically study defects that are correlated with the magnetic lattice. We anticipate that controlled defect creation allows for tailor-made complex magnetic textures and phases with direct optical access.