Kondo effect in the presence of magnetic impurities.
We measure transport through gold grain quantum dots fabricated using electromigration, with magnetic impurities in the leads. A Kondo interaction is observed between dot and leads, but the presence of magnetic impurities results in a gate-dependent zero-bias conductance peak that is split due to a RKKY interaction between the spin of the dot and the static spins of the impurities. A magnetic field restores the single Kondo peak in the case of an antiferromagnetic RKKY interaction. This system provides a new platform to study Kondo and RKKY interactions in metals at the level of a single spin.
Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands. hubert@qt.tn.tudelft.nl
H B
HB
Heersche
Z
Z
de Groot
J A
JA
Folk
L P
LP
Kouwenhoven
H S J
HS
van der Zant
A A
AA
Houck
J
J
Labaziewicz
I L
IL
Chuang