Signatures of entanglement and quantum phase transitions in parallel quantum dots

Department of Physics, University of Florida, P.O. Box 118440, Gainesville, Florida 32611, USA(Dated: September 19, 2011)We study a strongly interacting “quantum dot 1” and a weakly interacting “dot 2” connectedin parallel to metallic leads. Gate voltages can drive the system between Kondo-quenched andfree-moment phases separated by Kosterlitz-Thouless quantum phase transitions. As interactionsin dot 2 become stronger relative to the dot-lead coupling, the free moment evolves from an isolatedspin-