Evidence of quantum interference in transport properties of a triple quantum dot T-shape system
Department of Physics and Astronomy, California State University Fullerton, Fullerton, CA, 92384, USA
2 Department of Theoretical Physics, “Babeş-Bolyai" University, 40084 Cluj-Napoca, Romania
Corresponding author: a firstname.lastname@example.org
Revised: 29 December 2010
Published online: 16 February 2011
We consider the transport and the noise characteristic in the case of a triple quantum dots T-shape system where two of the dots form a two-level system and the other works in a detector-like setup. Our theoretical results are obtained using the equation of motion method for the case of zero and finite on-site Coulomb interaction in the detector dot. We present analytic results for the electronic Green's functions in the system's component quantum dots, and we used numerical calculations to evaluate the system's transport properties. The transport trough the T-shaped system can be controlled by varying the coupling between the two-level system dots or the coupling between the detector dot and the exterior electrodes. The system's conductance presents Fano dips for both strong (fast detector) and weak coupling (slow detector) between the detector dot and the external electrodes. Due to stronger electronic correlations the noise characteristics in the case of a slow detector are much higher. This setup may be of interest for the practical realization of qubit states in quantum dots systems.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2011