Coherent transport through a ring of three quantum dots

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.80.075415
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TypeArticle
Journal titlePhysical Review B - Condensed Matter and Materials Physics
ISSN1098-0121
Volume80
Issue7
Article number75415
AbstractLow field magnetotransport measurements have been performed on a ring of three few electrons quantum dots with well-defined electron occupations. In particular detailed measurements were made at two quadruple points (where four electronic configurations are degenerate) searching for an interplay between spin-blockade mechanisms and the Aharanov-Bohm effect. Measurements were also made at neighboring triple points. An analysis of the experimental magnetotransport fast Fourier transforms (FFTs) confirms coherent transport in our device. We find, however, transport features virtually independent of the particular quantum-dot configuration in the sense that the same periods and general behavior are observed in all of the FFTs. The two dominant frequencies in the FFTs were related by a factor 3. The origin of this fractional feature in the magnetoconductance behavior is not well understood. Other even higher frequency periods also exist. All magnetoconductance periods are found to be limited by phase rigidity, confirming that their origin lies within the quantum dot circuit itself. © 2009 The American Physical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Microstructural Sciences
Peer reviewedYes
NPARC number21274641
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Record identifier0d0e0ca3-800d-4afe-89c7-4c016c0379e9
Record created2015-03-18
Record modified2016-05-09
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