Issue Europhys. Lett. Volume 67, Number 3, August 2004 Page(s) 439 - 445 Section Condensed matter: electronic structure, electrical, magnetic, and optical properties DOI 10.1209/epl/i2004-10084-x

Europhys. Lett., 67 (3), pp. 439-445 (2004)
DOI: 10.1209/epl/i2004-10084-x

Multi-terminal transport through a quantum dot in the Coulomb-blockade regime

R. Leturcq¹, D. Graf¹, T. Ihn¹, K. Ensslin¹, D. D. Driscoll² and A. C. Gossard<sup>2

1</sup>  Solid State Physics Laboratory, ETH Zürich - 8093 Zürich, Switzerland
²  Materials Department, University of California - Santa Barbara, CA 93106, USA

leturcq@phys.ethz.ch

(Received 10 May 2004; accepted 28 May 2004)

Abstract
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.

PACS
73.23.Hk - Coulomb blockade; single-electron tunneling.
73.63.Kv - Quantum dots.

© EDP Sciences 2004

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