Giant Zeeman splitting and zero-field splitting (ZFS) are observed in 2D nanosheets that have monolayers of atomic thickness. In this study, single-crystalline CdSe(ethylenediamine)0.5 and Mn2+-doped nanosheets are synthesized via a solvothermal process. Tunable amounts of Mn2+(0.5-8.0%) are introduced, resulting in lattice contraction as well as phosphorescence from five unpaired electrons. The exciton dynamics are dominated by spin-related electronic transitions (4T1 → 6A1) with long lifetimes (20.5, 132, and 295 μs). Temperature-varied EPR spectroscopy with spectral simulation reveals large ZFS (D = 3850 MHz) due to axial distortion of substituted Mn2+ (S = 5/2). In the magnetic circular dichroism (MCD) measurements, we observed giant Zeeman splitting with large effective g values (up to 231 ± 21), which implies huge sp-d exchange interactions in 2D monolayer regimes, leading to diluted magnetic semiconductor (DMS) materials.

中文翻译：

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室温下单层纳米片的巨型塞曼分裂

在具有原子厚度单层的二维纳米片中观察到巨型塞曼分裂和零场分裂 (ZFS)。在这项研究中，通过溶剂热法合成了单晶 CdSe(乙二胺)0.5 和 Mn2+ 掺杂的纳米片。引入可调量的 Mn2+（0.5-8.0%），导致晶格收缩以及来自五个不成对电子的磷光。激子动力学主要是与自旋相关的电子跃迁（4T1 → 6A1），寿命长（20.5、132 和 295 μs）。由于取代的 Mn2+ (S = 5/2) 的轴向变形，具有光谱模拟的温度变化 EPR 光谱显示大 ZFS (D = 3850 MHz)。在磁圆二色性 (MCD) 测量中，我们观察到具有大有效 g 值（高达 231 ± 21）的巨大塞曼分裂，