Regensburg 2007 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 24: Quantum dots and wires: Transport properties II

HL 24.3: Talk

Tuesday, March 27, 2007, 14:30–14:45, H15

Theory of super-Poissonian noise in tunneling through a quantum dot stack — •Gerold Kiesslich¹, Eckehard Schöll¹, Frank Hohls², and Rolf Haug² — ¹Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, D-10623 Berlin — ²Institut für Festkörperphysik, Universität Hannover, Appelstr. 2, D-30167 Hannover

The tunneling current through two layers of self-organized quantum dots which are vertically aligned (quantum dot stacks) provides sharp resonances in the current-voltage characteristics when the bias voltage is varied. The additional measurement of the shot noise reveals positive temporal correlations (super-Poissonian noise) close to these current peaks [1] associated with a bunching of tunneling events. This phenomenon is discussed in terms of a sequential tunneling model for a single quantum dot stack demonstrating that it can be explained by the sole effect of Coulomb interaction between electrons inside the stack [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, F. Hohls, and R. J. Haug. in preparation (2007).