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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. Schoell, T. Brandes, F. Hohls, and R. J. Haug, to be published in Phys. Rev. Lett (2007), cond-mat/0706.1737. |
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