Dresden 2003 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 12: Quantenpunkte und -dr
ähte: Transporteigenschaften II

HL 12.7: Vortrag

Montag, 24. März 2003, 16:45–17:00, POT/81

Aharonov-Bohm Interferometry with Quantum Dots – Scattering Approach versus Tunneling Picture — •Björn Kubala and Jürgen König — Institut für Theoretische Festkörperphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany

We address the question of how to model electron transport through closed Aharonov-Bohm interferometers containing quantum dots. By explicitly studying interferometers with one and two quantum dots, we establish the connection between a tunneling-Hamiltonian formulation on the one hand and a scattering-matrix approach on the other hand. We prove that, under certain circumstances, both approaches are equivalent, i.e., both types of models can describe the same experimental setups. Furthermore, we analyze the interplay of both the Aharonov-Bohm phase and the orbital phase associated with the lengths of the system on the transport properties.