Dicke Effect in the Tunnel Current through two Double Quantum Dots
arXiv:cond-mat/0305439 · doi:10.1103/PhysRevB.68.035309
Abstract
We calculate the stationary current through two double quantum dots which are interacting via a common phonon environment. Numerical and analytical solutions of a master equation in the stationary limit show that the current can be increased as well as decreased due to a dissipation mediated interaction. This effect is closely related to collective, spontaneous emission of phonons (Dicke super- and subradiance effect), and the generation of a `cross-coherence' with entanglement of charges in singlet or triplet states between the dots. Furthermore, we discuss an inelastic `current switch' mechanism by which one double dot controls the current of the other.
12 pages, 6 figures, to appear in Phys. Rev. B