Quantum monte carlo simulation RKKY interaction Magnetic adatoms on surface
Issue Date:
2010
Publisher:
Journal of the Physical Society of Japan
Citation:
Volume: 79, Issue: 7
Abstract:
For a system of two magnetic adatoms on a metal surface at finite temperatures, we calculate the
spectral density at adatom sites. At sufficiently low temperatures, the peak structure at the Fermi level,
which originates from the coupling between the local moments of adatoms and conduction electrons,
corresponds to the Yosida-Kondo resonance. In addition, we also consider the indirect Ruderman-Kittel-
Kasuya-Yosida (RKKY) interaction between the adatoms, which is mediated by the conduction electrons of
the metal surface, and depends strongly on the adatom separation. Under strong ferromagnetic (FM) RKKY
interaction, the peak structure disappears, while under antiferromagnetic (AF) RKKY interaction, the width
of the peak structure increases in comparison to that of the single adatom case. Our conclusion of the
spectral density variation in the two dimensional system can be con.rmed by experiments on the surface, for
example by the scanning tunneling spectroscopy. ?? 2010 The Physical Society of Japan.
