Anomalously large g factor of single atoms adsorbed on a metal substrate
Anomalously large g factor of single atoms adsorbed on a metal substrate
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DOI：
10.1103/physrevb.84.212401
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发表时间：
2011-12-06
影响因子：
3.7
通讯作者：
Wiesendanger, R.
中科院分区：
文献类型：
--
作者：
Chilian, B.;Khajetoorians, A. A.;Wiesendanger, R.
我们对吸附在 Ag(111) 表面上的单个 Fe 原子进行了非弹性扫描隧道光谱 (ISTS)。 ISTS 揭示了磁化激发的寿命约为 400 fs，在施加磁场时会线性减小。令人惊讶的是，我们发现表征磁场中激发能量偏移的 g 因子为 g = 3.1，而不是预期值 2。当考虑 Ag(111) 表面态和 Fe 原子的完整电子结构时，可以理解这种非常大的 g 偏移，如磁化率的从头计算所示。
We have performed inelastic scanning tunneling spectroscopy (ISTS) on individual Fe atoms adsorbed on a Ag(111) surface. ISTS reveals a magnetization excitation with a lifetime of about 400 fs, which decreases linearly upon application of a magnetic field. Surprisingly, we find that the g factor, which characterizes the shift in energy of the excitation in a magnetic field, is g = 3.1 instead of the expected value of 2. This very large g shift can be understood when considering the complete electronic structure of both the Ag(111) surface state and the Fe atom, as shown by ab initio calculations of the magnetic susceptibility.