Spatial and spectroscopic profiles of the Kondo resonance for a single magnetic atom on a metal surface under an external magnetic field

Manifestations of the Kondo effect on an atomic length scale on and around a magnetic atom adsorbed on a nonmagnetic metal surface differ depending on which spectroscopic mode the scanning tunneling microscope is operated. In a series of reports, we showed that the Kondo effect can be directly obser ved as protrusions (peaks) in the spatial distribution of the tunneling cur rent, and that the protrusions (peaks) observed in the spatial distribution of the tunneling current correspond to the resonances observed in the diff erential conductance spectra. In this report, we show that upon applying an external magnetic field with increasing magnitude, the protrusions (peaks) observed in the spin-resolved spatial distribution of the tunneling curren t would decrease monotonically for spin-down electrons, but change non-mono tonically for spin-up electrons. We also show that, upon applying an extern al magnetic field, additional features about the Fermi level appear for the narrow dip structure observed for the corresponding differential conductan ce spectra.