Abstract
We present transport measurements on a system of two lateral quantum dots in a perpendicular magnetic field. Due to edge channel formation in an open conducting region, the quantum dots are chirally coupled. When both quantum dots are tuned into the Kondo regime simultaneously, we observe a change in the temperature dependence of the differential conductance. This is explained by the RKKY exchange interaction between the two dots. As a function of bias the differential conductance shows a splitting of the Kondo resonance which changes in the presence of RKKY interaction.
Highlights
Semiconductor quantum dots (QDs) are highly tunable devices and have attracted much interest in the scientic community
The dierential conductance G2 of QD2 in Fig. 1 (d) shows a more complicated pattern: a negative of the Kondo chessboard in QD1 is visible that is superimposed by a stripe pattern
Since this eect can be observed in both QDs for both magnetic eld polarities, it is not caused by any electrostatic eect
Summary
Semiconductor quantum dots (QDs) are highly tunable devices and have attracted much interest in the scientic community. One possible mechanism to entangle the spins of dierent QDs beyond the nearest neighbour approach is the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between magnetic moments. This indirect non-local exchange interaction is mediated by charge carriers and locks the magnetic moments in a new ground state. The latter is either ferromagnetic or antiferromagnetic depending on the distance between the magnetic moments and the Fermi wave vector of the charge carriers [2].
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