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Title

Engineering drag currents in Coulomb coupled quantum dots

AuthorsLim, Jong-Soo ; Sánchez, David ; López, Rosa
Issue Date15-Feb-2018
PublisherInstitute of Physics Publishing
CitationNew Journal of Physics 20: 023038 (2018)
AbstractThe Coulomb drag phenomenon in a Coulomb-coupled double quantum dot system is revisited with a simple model that highlights the importance of simultaneous tunneling of electrons. Previously, cotunneling effects on the drag current in mesoscopic setups have been reported both theoretically and experimentally. However, in both cases the sequential tunneling contribution to the drag current was always present unless the drag level position were too far away from resonance. Here, we consider the case of very large Coulomb interaction between the dots, whereby the drag current needs to be assisted by cotunneling events. As a consequence, a quantum coherent drag effect takes place. Further, we demonstrate that by properly engineering the tunneling probabilities using band tailoring it is possible to control the sign of the drag and drive currents, allowing them to flow in parallel or antiparallel directions. We also show that the drag current can be manipulated by varying the drag gate potential and is thus governed by electron- or hole-like transport.
Publisher version (URL)https://doi.org/10.1088/1367-2630/aaac0e
URIhttp://hdl.handle.net/10261/189087
DOI10.1088/1367-2630/aaac0e
E-ISSN1367-2630
Appears in Collections:(IFISC) Artículos
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