Multi-terminal transport through a quantum dot in the Coulomb-blockade regimeR. Leturcq1, D. Graf1, T. Ihn1, K. Ensslin1, D. D. Driscoll2 and A. C. Gossard2
1 Solid State Physics Laboratory, ETH Zürich - 8093 Zürich, Switzerland
2 Materials Department, University of California - Santa Barbara, CA 93106, USA
(Received 10 May 2004; accepted 28 May 2004)
Three-terminal tunnelling experiments on quantum dots in the Coulomb-blockade regime allow a quantitative determination of the coupling strength of individual quantum states to the leads. Exploiting this insight, we have observed independent fluctuations of the coupling strengths as a function of electron number and magnetic field due to changes in the shape of the wave function in the dot. Such a detailed understanding and control of the dot-lead coupling can be extended to more complex systems such as coupled dots, and are essential for building functional quantum electronic systems.
73.23.Hk - Coulomb blockade; single-electron tunneling.
73.63.Kv - Quantum dots.
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