Abstract
We use laterally coupled two self-assembled quantum dots (QDs) to study the effect of asymmetric coupling to the source and drain electrodes. From the measured stability diagram, we confirm that one QD (Dot 1 ) is tunnel-coupled to the two electrodes, whereas the other (Dot 2) is only tunnel-coupled to one electrode. We observe the asymmetric current-voltage characteristics, when Dot 2 acts as an electron trap only for one bias polarity to impede the electron flow through Dot 1 due to the inter-dot Coulomb coupling. This phenomenon can be understood within the scheme of charge ratchet effect.
Original language | English |
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Pages (from-to) | 145011-145013 |
Number of pages | 3 |
Journal | Applied Physics Express |
Volume | 2 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2009 Jan 1 |
ASJC Scopus subject areas
- Engineering(all)
- Physics and Astronomy(all)