Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2005-05-13
Appl.Phys.Lett. 89, 052101 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4 pages, 2 figures, submitted to PRL
Scientific paper
10.1063/1.2260827
We study charge transport through a chain of quantum dots. The dots are fully coherent among each other and weakly coupled to metallic electrodes via the dots at the interface, thus modelling a molecular wire. If the non-local Coulomb interactions dominate over the inter-dot hopping we find strongly enhanced shot noise above the sequential tunneling threshold. The current is not enhanced in the region of enhanced noise, thus rendering the noise super-Poissonian. In contrast to earlier work this is achieved even in a fully symmetric system. The origin of this novel behavior lies in a competition of "slow" and "fast" transport channels that are formed due to the differing non-local wave functions and total spin of the states participating in transport. This strong enhancement may allow direct experimental detection of shot noise in a chain of lateral quantum dots.
Aghassi Jasmin
Hettler Matthias H.
Schön Gerd
Thielmann Axel
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