Zero-field kondo splitting and quantum-critical transition in double quantum dots

• Published in: Physical review letters Vol. 97; no. 9; p. 096603
• Main Authors: Dias da Silva, Luis G G V, Sandler, Nancy P, Ingersent, Kevin, Ulloa, Sergio E
• Format: Journal Article
• Language: English
• Published: United States 01-09-2006
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/physrevlett.97.096603

Double quantum dots offer unique possibilities for the study of many-body correlations. A system containing one Kondo dot and one effectively noninteracting dot maps onto a single-impurity Anderson model with a structured (nonconstant) density of states. Numerical renormalization-group calculations show that, while band filtering through the resonant dot splits the Kondo resonance, the singlet ground state is robust. The system can also be continuously tuned to create a pseudogapped density of states and access a quantum-critical point separating Kondo and non-Kondo phases.