Transition between quantum states in a parallel-coupled double quantum dot

Strong electron and spin correlations in a double quantum dot (DQD) can give rise to different quantum states. We observe a continuous transition from a Kondo state exhibiting a single-peak Kondo resonance to another exhibiting a double peak by increasing the interdot coupling (t) in a parallel-coup...

Full description

Saved in:
Bibliographic Details
Published inPhysical review letters Vol. 92; no. 17; p. 176801
Main Authors Chen, J C, Chang, A M, Melloch, M R
Format Journal Article
LanguageEnglish
Published United States 30.04.2004
Online AccessGet more information

Cover

More Information
Summary:Strong electron and spin correlations in a double quantum dot (DQD) can give rise to different quantum states. We observe a continuous transition from a Kondo state exhibiting a single-peak Kondo resonance to another exhibiting a double peak by increasing the interdot coupling (t) in a parallel-coupled DQD. The transition into the double-peak state provides evidence for spin entanglement between the excess electrons on each dot. Toward the transition, the peak splitting merges and becomes substantially smaller than t because of strong Coulomb effects. Our device tunability bodes well for future quantum computation applications.
ISSN:0031-9007
DOI:10.1103/physrevlett.92.176801