Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 63, Issue -, Pages 241-247Publisher
ELSEVIER
DOI: 10.1016/j.physe.2014.06.006
Keywords
Quantum dot; Quantum wire; Transient current; Current beats
Funding
- Polish Ministry of Science and Higher Education [N N202 263 138]
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The transient electric current and quantum dot (QD) occupation probabilities in a linear wire of N quantum dots coupled with two leads are investigated theoretically for vertical (T-shaped) and horizontal geometries of QDs. The model tight binding Hamiltonian with inter dot Coulomb interactions and the equation of motion technique are used in our calculations. The charging time of the initially empty wire is analyzed, It turns out that for both wire configurations the QD charging time grows up linearly for subsequent dots with simultaneously decreasing rate of the charging process, except the Nth clot. We have also shown that the transient current beats appearing in response to the sudden change of the bias voltage exhibit different patterns depending on the wire inter-site couplings. In some cases the structure of these beats provides useful information about the system parameters. (C) 2014 Elsevier By. All rights reserved,
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