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Originally published in Science Express on 25 March 2004
Science 23 April 2004:
Vol. 304. no. 5670, pp. 565 - 567
DOI: 10.1126/science.1095452
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Reports

Tunable Nonlocal Spin Control in a Coupled-Quantum Dot System

N. J. Craig,1 J. M. Taylor,1 E. A. Lester,1 C. M. Marcus,1* M. P. Hanson,2 A. C. Gossard2

The effective interaction between magnetic impurities in metals that can lead to various magnetic ground states often competes with a tendency for electrons near impurities to screen the local moment (known as the Kondo effect). The simplest system exhibiting the richness of this competition, the two-impurity Kondo system, was realized experimentally in the form of two quantum dots coupled through an open conducting region. We demonstrate nonlocal spin control by suppressing and splitting Kondo resonances in one quantum dot by changing the electron number and coupling of the other dot. The results suggest an approach to nonlocal spin control that may be relevant to quantum information processing.

1 Department of Physics, Harvard University, Cambridge, MA 02138, USA.
2 Materials Department, University of California, Santa Barbara (UCSB), Santa Barbara, CA 93106, USA.

* To whom correspondence should be addressed. E-mail: marcus{at}harvard.edu

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