A Tunable Kondo Effect in Quantum Dots

Author:

Cronenwett Sara M.1,Oosterkamp Tjerk H.1,Kouwenhoven Leo P.1

Affiliation:

1. 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.

Abstract

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference27 articles.

1. For a review see L. P. Kouwenhoven et al. in Mesoscopic Electron Transport Proceedings of a NATO Advanced Study Institute L. L. Sohn L. P. Kouwenhoven G. Schön Eds. (Kluwer Dordrecht Netherlands 1997) ser. E vol. 345 pp. 105–214; available at:

2. For a review on cotunneling see D. V. Averin and Y. V. Nazarov in Single Charge Tunneling Proceedings of a NATO Advanced Study Institute H. Grabert and M. H. Devoret Eds. (Plenum New York 1991) ser. B vol. 294 pp. 217–247.

3. L. I. Glazman and M. É. Raikh Pis'ma Zh. Eksp. Teor. Fiz. 47 378 (1988) [ JETP Lett. 47 452 (1988)].

4. On-Site Coulomb Repulsion and Resonant Tunneling

5. Kawabata A., J. Phys. Soc. Jpn. 60, 3222 (1991).

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