Theory of differential conductance of Co on Cu(111) including Co s and d orbitals, and surface and bulk Cu states

Abstract

We revisit the theory of the Kondo effect observed by a scanning-tunneling microscope (STM) for transition-metal atoms (TMAs) on noble-metal surfaces, including $d$ and $s$ orbitals of the TMA, surface and bulk conduction states of the metal, and their hoppingto the tip of the STM. Fitting the experimentally observed STM differential conductance for Co on Cu(111) including both, the Kondo feature near the Fermi energy and the resonance below the surface band, we conclude that the STM senses mainly the Co $s$ orbital and that the Kondo antiresonance is due to interference between states with electrons in the $s$ orbital and a localized $d$ orbital mediated by the conduction states.

6 pages, 5 figures, clarifications about the resonance below the surface band added

References in corpus (4)

• Kondo effect in single atom contacts: the importance of the atomic geometry
• Kondo resonance of a Co atom exchange coupled to a ferromagnetic tip
• Shifting the Voltage Drop in Electron Transport through a Single Molecule
• Theory of Scanning Tunneling Spectroscopy: from Kondo Impurities to Heavy Fermion Materials

Cited by in corpus (8)

• Iron phthalocyanine on Au(111) is a "non-Landau" Fermi liquid
• Moiré tuning of spin excitations: Individual Fe atoms on MoS${}_2$/Au(111)
• Spin-resolved spectroscopic evidence for spinarons in Co adatoms
• Surface states influence in the conductance spectra of Co adsorbed on Cu(111)
• Topological quantum phase transition in individual Fe Atoms on MoS${}_2$/Au(111)
• Spin current at a magnetic junction as a probe of the Kondo state
• Lieb lattices formed by real atoms on Ag(111) and their lattice constant dependent electronic properties
• Signatures of Kondo-lattice behavior in the two-dimensional ferromagnet Fe${}_3$GeTe${}_2$