Tunable Nonlocal Spin Control in a Coupled-Quantum Dot System

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 tw...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2004-04, Vol.304 (5670), p.565-567
Main Authors: Craig, N. J., Taylor, J. M., Lester, E. A., Marcus, C. M., Hanson, M. P., Gossard, A. C.
Format: Article
Language:English
Subjects:
Classical and quantum physics: mechanics and fields
Climate
Electric potential
Electron spin
Electrons
Even numbers
Exact sciences and technology
Impurities
Information Processing
Kondo effect
Magnetic fields
Medical research
Metals
Micelles
Nanocrystals
Odd numbers
Physics
Quantum dots
Quantum electrodynamics
Quantum information
Signatures
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Summary: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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1095452