Electron transport through Aharonov-Bohm interferometer with laterally coupled double quantum dots

Details Electron transport through Aharonov-Bohm interferometer with laterally coupled double quantum dots Electron transport through Aharonov-Bohm interferometer with laterally coupled double quantum dots

2006-02-23

arxiv.org/abs/cond-mat/0602539v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages, 13 figures

Scientific paper

10.1103/PhysRevB.74.205310

We theoretically investigate electron transport through an Aharonov-Bohm interferometer containing laterally coupled double quantum dots. We introduce the indirect coupling parameter $\alpha$, which characterizes the strength of the coupling via the reservoirs between two quantum dots. $|\alpha|=1$ indicates the strongest coupling, where only a single mode contributes to the transport in the system. Two conduction modes exist in a system where $|\alpha|\neq 1$. The interference effects such as the Fano resonance and the Aharonov-Bohm oscillation are suppressed as the absolute value of the parameter $\alpha$ decreases from 1. The linear conductance does not depend on the flux when $\alpha=0$ since it corresponds to independent coupling of the dots to the reservoir modes.

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