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

R. Leturcq, D. Graf, T. Ihn, K. Ensslin, D. D. Driscoll, A. C. Gossard

Published 2004-06-02Version 1

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 is essential for building functional quantum electronic systems.