Cotunneling-mediated transport through excited states in the Coulomb blockade regime

Details Cotunneling-mediated transport through excited states in the Coulomb blockade regime Cotunneling-mediated transport through excited states in the Coulomb blockade regime

2005-03-02

arxiv.org/abs/cond-mat/0503037v1

Phys. Rev. Lett. 94, 206805 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.94.206805

We present finite bias transport measurements on a few-electron quantum dot. In the Coulomb blockade regime, strong signatures of inelastic cotunneling occur which can directly be assigned to excited states observed in the non-blockaded regime. In addition, we observe structures related to sequential tunneling through the dot, occuring after it has been excited by an inelastic cotunneling process. We explain our findings using transport calculations within the real-time Green's function approach, including diagrams up to fourth order in the tunneling matrix elements.

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