A new view on the origin of zero-bias anomalies of Co atoms atop noble metal surfaces

Abstract

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.

Supplementary Information included

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Cited by in corpus (7)

• Correlating Josephson supercurrents and Shiba states in quantum spins unconventionally coupled to superconductors
• Modulated Kondo screening along magnetic mirror twin boundaries in monolayer MoS2 on graphene
• Spin-resolved spectroscopic evidence for spinarons in Co adatoms
• Non-local correlation effects due to virtual spin-flip processes in itinerant electron ferromagnets
• Tuning spinaron and Kondo resonances via quantum confinement
• Spin-orbit coupling and Kondo resonance in Co adatom on Cu(100) surface: DFT+ED study
• Phases and phase transitions of an $S=3/2$ chain on metallic and semi-metallic surfaces