贵金属表面Co原子零偏压反常起源的新观点
A new view on the origin of zero-bias anomalies of Co atoms atop noble metal surfaces
摘要：
多体现象在物理学中是最重要的。在凝聚态物质中，它们的特点是相当广泛的材料特性，包括电子，磁性，热力学和传输特性。它们可能在光谱测量中留下非平凡的签名，例如分配给近藤，激子和极化子特征的签名，其出现取决于所涉及的自由度。在这里，我们解决系统的零偏压异常检测扫描隧道光谱的Co原子沉积在Cu，Ag和Au（111）衬底，这显着是几乎相同的第一性原理。这些功能源于由有限的磁各向异性能量引起的间隙自旋激发，与通常广泛的解释，将它们与近藤共振。依靠相对论含时密度泛函和多体微扰理论，我们进一步揭示了一个新的多体功能，spinaron，产生于电子和自旋激发的相互作用，定位在一个明确定义的能量的电子态。
英文摘要：
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.
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