Eur. Phys. J. B 61, 419-425 (2008)
https://doi.org/10.1140/epjb/e2008-00089-9

Entanglement and the Kondo effect in serially coupled double quantum dots

¹ Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana, Slovenia
² Jožef Stefan Institute, 1000 Ljubljana, Slovenia

Corresponding author: ^a anton.ramsak@fmf.uni-lj.si

Received: 26 October 2007
Revised: 18 January 2008
Published online: 1 March 2008

Abstract

We investigate entanglement between electrons in serially coupled double quantum dots attached to noninteracting leads. In addition to local repulsion we consider the influence of capacitive inter-dot interaction. We show how the competition between extended Kondo and local singlet phases determines the ground state and thereby the entanglement. The results are additionally discussed in connection with the linear conductance through the system.