Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 35: Transport: Nanoelectronics I - Quantum Dots, Wires, Point Contacts 3

TT 35.14: Talk

Thursday, February 28, 2008, 17:45–18:00, H 3010

Quantum Transport in a Multi Particle Triple Quantum Dot — •Pöltl Christina, Emary Clive, and Brandes Tobias — Institut für Theoretische Physik, Hardenbergstr. 36, D-10623 TU Berlin, Germany

It is known that in the transport through triple quantum dot systems so-called dark states can occur [1, 2]. An electron entering such a state is trapped in the quantum dot system due to destructive interference and this leads to a blockade in current. Such states have previously been discussed only in the strong Coulomb blockade regime, where at most one excess electron is present in the system at any one time.

In this contribution, we discuss the effects of relaxing this condition, and permit multiple dot-occupancies. We use an number-resolved master equation approach to calculate the current, noise and counting statistics of the system, and show how the experimentally relevant quantities show a combination of dark-state and multiple-occupancy effects. We also consider signatures of electronic entanglement in the system.

[1] B. Michaelis, C. Emary and C. W. J. Beenakker, Europhys. Lett., 73 (5), pp. 677-683 (2006)

[2] C. W. Groth, B. Michaelis, and C. W. J. Beenakker, Phys. Rev B 74, 125315 (2006)