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

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

2004-04-08

arxiv.org/abs/cond-mat/0404213v2

Science 304, 565 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

related articles available at http://marcuslab.harvard.edu

Scientific paper

10.1126/science.1095452

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.

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