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Science 21 September 2001:
Vol. 293. no. 5538, pp. 2221 - 2223
DOI: 10.1126/science.1063182
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Reports

The Kondo Effect in an Artificial Quantum Dot Molecule

H. Jeong,1 A. M. Chang,1* M. R. Melloch2

Double quantum dots provide an ideal model system for studying interactions between localized impurity spins. We report on the transport properties of a series-coupled double quantum dot as electrons are added one by one onto the dots. When the many-body molecular states are formed, we observe a splitting of the Kondo resonance peak in the differential conductance. This splitting reflects the energy difference between the bonding and antibonding states formed by the coherent superposition of the Kondo states of each dot. The occurrence of the Kondo resonance and its magnetic field dependence agree with a simple interpretation of the spin status of a double quantum dot.

1 Department of Physics, Purdue University, West Lafayette, IN 47907, USA.
2 School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA.
*   To whom correspondence should be addressed. E-mail: yingshe{at}physics.purdue.edu

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