DOI: 10.1126/science.281.5376.540 ISSN:
A Tunable Kondo Effect in Quantum Dots
Sara M. Cronenwett, Tjerk H. Oosterkamp, Leo P. Kouwenhoven- Multidisciplinary
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.