Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 6: Quantum dots and wires: Transport properties I
HL 6.9: Vortrag
Montag, 27. März 2006, 12:15–12:30, BEY 118
Tunneling resonances in quantum dots: Coulomb interaction modifies the width — •Björn Kubala1, Jens Könemann2, Jürgen König1, and Rolf J. Haug2 — 1Institut für Theoretische Physik III, Ruhr-Universität Bochum, D-44780 Bochum, Germany — 2Institut für Festkörperphysik, Universität Hannover, Appelstrasse 2, D-30167 Hannover, Germany
Single-electron tunneling through a zero-dimensional state in an asymmetric double-barrier resonant-tunneling structure is studied [1]. The broadening of steps in the I–V characteristics is found to strongly depend on the polarity of the applied bias voltage. Based on a qualitative picture for the finite-life-time broadening of the quantum dot states and a quantitative comparison of the experimental data with a non-equilibrium transport theory, we identify this polarity dependence as a clear signature of Coulomb interaction.
[1] J. Könemann, B. Kubala, J. König, and R. J. Haug, cond-mat/0506505 (unpublished).