Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 30: Quantum dots and wires: Transport properties II
HL 30.12: Vortrag
Dienstag, 26. Februar 2008, 17:15–17:30, ER 164
Noise enhancement due to quantum coherence in coupled quantum dots — •Gerold Kiesslich1, Eckehard Schöll1, Tobias Brandes1, Frank Hohls2, and Rolf J. Haug2 — 1Institut für Theroretische Physik, Technische Universität Berlin — 2Institut für Festkörperphysik, Leibniz Universität Hannover
We show that the intriguing observation of noise enhancement in the charge transport through two vertically coupled self-assembled quantum dots [1] can be explained by the interplay of quantum coherent coupling between the dots and strong Coulomb blockade. We demonstrate that this novel mechanism for super-Poissonian charge transfer is very sensitive to decoherence caused by electron-phonon scattering as inferred from the measured temperature dependence [2].
[1] P. Barthold, F. Hohls, N. Maire, K. Pierz, and R. J. Haug,
Phys. Rev. Lett. 96, 246804 (2006).
[2] G. Kießlich, E. Schöll, T. Brandes, F. Hohls, and R. J. Haug, to be published in Phys. Rev. Lett. 99 (2007), cond-mat/0706.1737.