Enhancement of Kondo effect through Rashba spin- orbit interactions: application to graphene
18.07.2011 at 16:00
since resistivity measurements on Pt doped Cu:Mn compounds were interpreted as evidence for
suppression of the Kondo effect by SO scattering. Since then, extensive theoretical and
experimental works have yielded conflicting results. In order to provide a clearer picture, we
have undertaken the study of an Anderson magnetic impurity model in a two-dimensional
metallic host with RSO interactions. We show that at the particlehole symmetry point, the
corresponding Hamiltonian for a single-channel Kondo regime is recovered. However, away
from particle-hole symmetry, a new term appears that shows the existence of the Dzyaloshiinski-
Moriya (DM) interaction between bath and impurity spins. Renormalization group equations
reveal that the impurity couples to the bath with ferroand antiferromagnetic couplings, with the
DM interactions introducing an exponential increase in the value of the Kondo temperature .
As a particular system of interest, we focus on non-suspended graphene with magnetic
impurities on top. After reviewing the effect of RSO interactions on graphene . I will discuss
the resulting Kondo regime when magnetic impurities are included.
 M. Zarea, S. E. Ulloa, and N. Sandler, arXiv:cond-mat 1105.3522 (2011).
 M. Zarea and N. Sandler, Phys. Rev. B 79, 155442 (2009).
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