论文标题
Stanene上磁性原子的自组装
Self-Assembly of Magnetic Co Atoms on Stanene
论文作者
论文摘要
我们通过使用密度功能理论（DFT）结合使用扫描隧道显微镜/光谱（STM/ST），研究了Cu（111）底物上的Ultraflat Stanene（111）底物上自组装的磁CO原子。通过将CO沉积到80 K处的Stanene/Cu（111）中，CO原子分别发展为单体，二聚体和三聚体结构，分别包含一个，两个和三个CO原子。根据原子解析的地形图像和偏置依赖性的明显高度，已经推断出基于CO原子代替的SN原子的原子结构模型，这与自洽的DFT计算和STM模拟都一致。除此之外，与CO -3D3Z2 -R2少数族裔相比，预计的状态密度（PDOS）最低率在-0.5 eV左右，在隧道电导率（DI/DU）中，在Co -Atomic copotra pastra pastra pastra tunneling电导率（DI/DU）中的峰值特征主要贡献。由于CO-3D多数和少数群体之间的交换分裂，有非零的磁矩，包括单体中约0.60 UB，二聚体0.56 UB，在Stanene上的Co Atom组件的Trimer中有0.29 UB。因此，这种磁Co原子组装可以提供重要的构建块，以稳定具有非平凡拓扑特性的二维（2D）stanene的局部磁性。
We have investigated the magnetic Co atoms self-assembled on the ultraflat stanene on Cu(111) substrate by utilizing scanning tunneling microscopy/spectroscopy (STM/STS) in conjunction with density functional theory (DFT). By means of depositing Co onto the stanene/Cu(111) held at 80 K, Co atoms have developed into the monomer, dimer, and trimer structures containing one, two, and three Co atoms respectively. As per atomically resolved topographic images and bias-dependent apparent heights, the atomic structure models based on Sn atoms substituted by Co atoms have been deduced, which are in agreement with both self-consistent DFT calculations and STM simulations. Apart from that, the projected density of states (PDOS) has revealed a minimum at around -0.5 eV from the Co-3d3z2-r2 minority band, which contributes predominately to the peak feature at about -0.3 eV in tunneling conductance (dI/dU) spectra taken at the Co atomic sites. As a result of the exchange splitting between the Co-3d majority and minority bands, there are non-zero magnetic moments, including about 0.60 uB in monomer, 0.56 uB in dimer, and 0.29 uB in trimer of the Co atom assembly on the stanene. Such magnetic Co atom assembly therefore could provide the vital building blocks in stabilizing the local magnetism on the two-dimensional (2D) stanene with non-trivial topological properties.
