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A Eichler¹, M Weiss, C Schönenberger

¹Department of Physics, University of Basel, Basel, Switzerland.

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Area of Science:

Condensed Matter Physics
Quantum Dots
Nanotechnology

Background:

The Kondo effect describes the interaction between localized magnetic moments and conduction electrons in metals.
Split Kondo resonances in quantum dots provide a platform to study complex magnetic interactions.
Understanding these effects is crucial for developing quantum computing technologies.

Purpose of the Study:

To investigate the split Kondo effect in a carbon nanotube quantum dot with multiple gate electrodes.
To analyze the influence of magnetic fields and gate configurations on Kondo resonance splitting.
To elucidate the underlying physical mechanisms, potentially involving a two-impurity Kondo effect.

Main Methods:

Nonlinear transport measurements were performed on a carbon nanotube quantum dot.
Variable magnetic fields were applied to observe changes in conductance peaks.
Multiple gate electrodes were utilized to tune the quantum dot's electronic properties.

Main Results:

Two distinct conductance peaks were observed at finite bias, which approached each other with increasing magnetic field.
A zero-bias Kondo resonance was recovered at finite magnetic fields under certain conditions.
An avoided crossing, rather than disappearance, of the split Kondo resonance was observed for specific gate configurations.
These results suggest a two-impurity Kondo effect with antiferromagnetic coupling.

Conclusions:

The observed phenomena are consistent with a two-impurity Kondo effect model.
Gate electrodes can tune the exchange coupling between the two effective spins.
A small antisymmetric contribution to the exchange interaction explains the non-recovery of the Kondo resonance in specific gate configurations.