Potential Energy通过可控氢配体驱动的自旋操纵
Potential Energy Driven Spin Manipulation via a Controllable Hydrogen Ligand
摘要：
带有自旋的分子可以稳定在表面上，并具有理想的性质，如可以通过外部刺激调节的净自旋。使用扫描探针，可以从地形或光谱数据推导出初始和最终的自旋状态，但系统如何在这些状态之间转换在很大程度上是未知的。在这里，我们解决了这个问题，通过操纵总自旋的磁性氢化钴复合物的波纹氮化硼表面上的氢功能化的扫描探针尖端，通过同时跟踪力和电导。当额外的氢配体靠近一氢化钴时，观察到在相关的S = 1 /2 Kondo状态（其中宿主电子屏蔽磁矩）和具有磁晶各向异性的S = 1状态之间切换。我们表明，总自旋的变化时，系统转移到一个新的势能面定义的氢在结中的位置。这些结果显示了化学功能化的尖端是如何以及为什么是操纵吸附原子和分子的有效工具，以及选择性调谐自旋系统的有前途的新方法。
英文摘要：
Spin-bearing molecules can be stabilized on surfaces and in junctions with desirable properties such as a net spin that can be adjusted by external stimuli. Using scanning probes, initial and final spin states can be deduced from topographic or spectroscopic data, but how the system transitioned between these states is largely unknown. Here we address this question by manipulating the total spin of magnetic cobalt hydride complexes on a corrugated boron nitride surface with a hydrogen- functionalized scanning probe tip by simultaneously tracking force and conductance. When the additional hydrogen ligand is brought close to the cobalt monohydride, switching between a corre- lated S = 1 /2 Kondo state, where host electrons screen the magnetic moment, and a S = 1 state with magnetocrystalline anisotropy is observed. We show that the total spin changes when the system is transferred onto a new potential energy surface defined by the position of the hydrogen in the junction. These results show how and why chemically functionalized tips are an effective tool to manipulate adatoms and molecules, and a promising new method to selectively tune spin systems.
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