Charge transport through a semiconductor quantum dot-ring nanostructure
| Autor: | Marcin Kurpas, Iwona Janus-Zygmunt, E. Wach, Barbara Kedzierska, Maciej M. Maśka, Elżbieta Zipper, Anna Gorczyca-Goraj |
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| Rok vydání: | 2015 |
| Předmět: |
Physics
Coupling Nanostructure Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Transistor Coulomb blockade FOS: Physical sciences Context (language use) Condensed Matter Physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect law.invention Rectification Quantum dot Quantum state law Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Materials Science |
| Zdroj: | Journal of physics. Condensed matter : an Institute of Physics journal. 27(26) |
| ISSN: | 1361-648X |
| Popis: | Transport properties of a gated nanostructure depend crucially on the coupling of its states to the states of electrodes. In the case of a single quantum dot the coupling, for a given quantum state, is constant or can be slightly modified by additional gating. In this paper we consider a concentric dot-ring nanostructure (DRN) and show that its transport properties can be drastically modified due to the unique geometry. We calculate the dc current through a DRN in the Coulomb blockade regime and show that it can efficiently work as a single electron transistor or a current rectifier. In both cases the transport characteristics strongly depends on the details of the confinement potential. The calculations are carried out for low and high bias regime, the latter being especially interesting in the context of current rectification due to fast relaxation processes. Comment: 24 pages, 13 figure |
| Databáze: | OpenAIRE |
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