Abstract
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 () 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 because of strong Coulomb effects. Our device tunability bodes well for future quantum computation applications.
- Received 12 May 2003
DOI:https://doi.org/10.1103/PhysRevLett.92.176801
©2004 American Physical Society