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A new view on the origin of zero-bias anomalies of Co atoms atop noble metal surfaces
Nature Communications ( IF 14.7 ) Pub Date : 2020-11-30 , DOI: 10.1038/s41467-020-19746-1
Juba Bouaziz , Filipe Souza Mendes Guimarães , Samir Lounis

Many-body phenomena are paramount in physics. In condensed matter, their hallmark is considerable on a wide range of material characteristics spanning electronic, magnetic, thermodynamic and transport properties. They potentially imprint non-trivial signatures in spectroscopic measurements, such as those assigned to Kondo, excitonic and polaronic features, whose emergence depends on the involved degrees of freedom. Here, we address systematically zero-bias anomalies detected by scanning tunneling spectroscopy on Co atoms deposited on Cu, Ag and Au(111) substrates, which remarkably are almost identical to those obtained from first-principles. These features originate from gaped spin-excitations induced by a finite magnetic anisotropy energy, in contrast to the usual widespread interpretation relating them to Kondo resonances. Resting on relativistic time-dependent density functional and many-body perturbation theories, we furthermore unveil a new many-body feature, the spinaron, resulting from the interaction of electrons and spin-excitations localizing electronic states in a well defined energy.



中文翻译:

贵金属表面Co原子零偏异常起源的新认识

多体现象在物理学中至关重要。在凝聚态物质中,它们在广泛的材料特性(包括电子,磁性,热力学和传输特性)方面具有可观的标志。它们可能会在光谱测量中留下非平凡的印记,例如分配给近藤,激子和极化特征的那些,其出现取决于所涉及的自由度。在这里,我们系统地解决了通过扫描隧道光谱法对沉积在Cu,Ag和Au(111)衬底上的Co原子检测到的零偏压异常现象,这些异常现象与从第一原理中获得的误差几乎相同。这些特征源自有限的磁各向异性能引起的带隙自旋激发,这与将其与近藤共振相关的通常的广泛解释相反。

更新日期:2020-12-01
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