Regensburg 2002 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 5: Quantenpunkte und -dr
ähte: Transporteigensch. I

HL 5.5: Vortrag

Montag, 11. März 2002, 11:30–11:45, H17

Flux-Dependent Level Attraction in Double-Dot Aharonov-Bohm Interferometers — •Björn Kubala and Jürgen König — Institut für Theoretische Festkörperphysik, Universität Karlsruhe, 76128 Karlsruhe

We study electron transport through a closed Aharonov-Bohm interferometer containing two single-level quantum dots. The quantum-dot levels are coupled to each other indirectly via the leads. We find that this coupling yields signatures of an effective flux-dependent level attraction in the linear conductance. Furthermore, we predict a suppression of transport when both levels are close to the Fermi level of the leads. The width of this anomaly is also flux dependent. We identify different regimes in which constructive interference of transmission through identical dots yields a signal that is 1, 2, or 4 times as large as the conductance through a single dot.

Ref.: B. Kubala and J. König, cond-mat/0110524, submitted to Phys. Rev. Lett.