2003/05/13 by J. C. Chen, A. M. Chang, M. R. Melloch
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Condensed matter physics #Coulomb #Coupling (piping) #Electron #Kondo effect #Materials science #Physics #Quantum #Quantum and electron transport phenomena #Quantum computer #Quantum dot #Quantum entanglement #Quantum mechanics #Resonance (particle physics) #Semiconductor Quantum Structures and Devices #Spin (aerodynamics) #cond-mat.mes-hall #cond-mat.str-el #quant-ph
paper · pdf · doi:10.1103/physrevlett.92.176801
5 pages, 4 figures
arxiv created 2003/05/13 · openalex publication_date 2004/04/27 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.