Tunable Non-local Spin Control in a Coupled Quantum Dot System

Science 304, 565 (2004) 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 (Kondo effect). The simplest system exhibiting the richness of this competit...

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Bibliographic Details
Main Authors Craig, N. J, Taylor, J. M, Lester, E. A, Marcus, C. M, Hanson, M. P, Gossard, A. C
Format Journal Article
LanguageEnglish
Published 08.04.2004
Subjects
Physics - Mesoscale and Nanoscale Physics
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Summary:Science 304, 565 (2004) 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 (Kondo effect). The simplest system exhibiting the richness of this competition, the two-impurity Kondo system, is here realized experimentally in the form of two quantum dots coupled through an open conducting region. We demonstrate non-local spin control by suppressing and splitting Kondo resonances in one quantum dot by changing electron number and coupling of the other dot. Results suggest an approach to non-local spin control relevant to quantum information processing.
DOI:10.48550/arxiv.cond-mat/0404213