论文标题
MN二聚体的非弹性电子隧道光谱
Inelastic electron tunneling spectroscopy of a Mn dimer
论文作者
论文摘要
扫描隧道显微镜（STM）可以通过旋转式式辅助隧道探测表面中单个磁原子的非弹性自旋激发。特定而有趣的情况是MN二聚体情况。我们在这里表明，当两个原子平均耦合到STM尖端和底物时，现有的非弹性传输光谱理论并不能解释观察到的自旋跃迁。表现出与核自旋的超精细偶联导致有限的激发幅度，但是导致观察到的大型非弹性信号的物理机制仍然未知。我们讨论了破坏系统对称性并允许更大的激发概率的其他替代方法。
A scanning tunneling microscope (STM) can probe the inelastic spin excitations of single magnetic atoms in a surface via spin-flip assisted tunneling. A particular and intriguing case is the Mn dimer case. We show here that the existing theories for inelastic transport spectroscopy do not explain the observed spin transitions when both atoms are equally coupled to the STM tip and the substrate. The hyperfine coupling to the nuclear spins is shown to lead to a finite excitation amplitude, but the physical mechanism leading to the large inelastic signal observed is still unknown. We discuss some other alternatives that break the symmetry of the system and allows for larger excitation probabilities.
