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Science 24 July 1998:
Vol. 281. no. 5376, pp. 540 - 544
DOI: 10.1126/science.281.5376.540
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Reports
A Tunable Kondo Effect in Quantum Dots
Sara M. Cronenwett,
Tjerk H. Oosterkamp,
Leo P. Kouwenhoven
A tunable Kondo effect has been realized in small quantum dots. A
dot can be switched from a Kondo system to a non-Kondo system as the
number of electrons on the dot is changed from odd to even. The Kondo
temperature can be tuned by means of a gate voltage as a
single-particle energy state nears the Fermi energy. Measurements of
the temperature and magnetic field dependence of a Coulomb-blockaded dot show good agreement with predictions of both equilibrium and nonequilibrium Kondo effects.
S. M. Cronenwett, Department of Applied Physics and DIMES,
Delft University of Technology, Post Office Box 5046, 2600 GA Delft,
Netherlands, and Department of Physics, Stanford University, Stanford,
CA, 94305-4060, USA. T. H. Oosterkamp and L. P. Kouwenhoven,
Department of Applied Physics and DIMES, Delft University of
Technology, Post Office Box 5046, 2600 GA Delft, Netherlands.
Read the Full Text
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