论文标题
碱金属原子和二聚体的电子顺磁共振上的超薄mgo
Electron paramagnetic resonance of alkali metal atoms and dimers on ultrathin MgO
论文作者
论文摘要
电子顺磁共振（EPR）可以为氧化物和半导体材料中掺杂剂的化学结构和磁性特性提供独特的见解，这些材料对电子，催化和量子传感的应用中感兴趣。在这里，我们证明了EPR与扫描隧道显微镜（STM）结合使用，可以探测Ag基板上超薄镁氧化镁层上碱金属原子的键和电荷状态。我们观察到$1μ_\ mathrm {b} $的磁矩，对于li $ _2 $，lina和na $ _2 $二聚体，对应于带电状态为$+1e $的旋转激进分子。单个碱原子具有相同的电荷状态，没有磁矩。吸附物的电离归因于通过氧化物向金属底物的电荷转移。我们的工作突出了EPR-STM的潜力，可以洞悉与控制表面和纳米台词的电气性能相关的掺杂原子。
Electron paramagnetic resonance (EPR) can provide unique insight into the chemical structure and magnetic properties of dopants in oxide and semiconducting materials that are of interest for applications in electronics, catalysis, and quantum sensing. Here, we demonstrate that EPR in combination with scanning tunneling microscopy (STM) allows for probing the bonding and charge state of alkali metal atoms on an ultrathin magnesium oxide layer on a Ag substrate. We observe a magnetic moment of $1μ_\mathrm{B}$ for Li$_2$, LiNa, and Na$_2$ dimers corresponding to spin radicals with a charge state of $+1e$. Single alkali atoms have the same charge state and no magnetic moment. The ionization of the adsorbates is attributed to charge transfer through the oxide to the metal substrate. Our work highlights the potential of EPR-STM to provide insight into dopant atoms that are relevant for the control of the electrical properties of surfaces and nanodevices.
