Indirect exchange interaction between magnetic adatoms in graphene

Exchange interaction between single magnetic adatoms.

The magnetic coupling between single Co atoms adsorbed on a copper surface is determined by probing the Kondo resonance using low-temperature scanning tunneling spectroscopy. The Kondo resonance, which is due to magnetic correlation effects between the spin of a magnetic adatom and the conduction electrons of the substrate, is modified in a characteristic way by the coupling of the neighboring ...

Exchange interaction between magnetic adatoms on surfaces of noble metals

E. Simon,1 B. Újfalussy,2 B. Lazarovits,2 A. Szilva,3 L. Szunyogh,3 and G. M. Stocks4 1Lóránd Eötvös University, Department of Physics, HU-1518 Budapest POB 32, Hungary 2Research Institute for Solid State Physics and Optics of the Hungarian Academy of Sciences, Konkoly-Thege M. út 29-33., HU-1121 Budapest, Hungary 3Department of Theoretical Physics, Budapest University of Technology and Economi...

Long-range interaction between adatoms in graphene.

We present a theory of electron-mediated interaction between adatoms in graphene. In the case of resonant scattering, relevant for hydrogenated graphene, a long-range 1/r interaction is found. This interaction can be viewed as a fermionic analog of the Casimir interaction, in which massless fermions play the role of photons. The interaction is an attraction or a repulsion depending on whether t...

Magnetic Ordering in Gd Monopnictides: Indirect Exchange Versus Superexchange Interaction

Orbital symmetry fingerprints for magnetic adatoms in graphene

In this paper, we describe the formation of local resonances in graphene in the presence of magnetic adatoms containing localized orbitals of arbitrary symmetry, corresponding to any given angular momentum state. We show that quantum interference effects which are naturally inbuilt in the honeycomb lattice in combination with the specific orbital symmetry of the localized state lead to the form...