Bipolar spin blockade and coherent state superpositions in a triple quantum dot

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DOIResolve DOI: http://doi.org/10.1038/nnano.2013.7
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TypeArticle
Journal titleNature Nanotechnology
ISSN1748-3387
Volume8
Issue4
Pages261265; # of pages: 5
Subjectlinear triple quantum dot; quantum dot; unclassified drug; article; bipolar spin blockade; electron transport; magnetic field; priority journal; process design; quantum mechanics
AbstractSpin qubits based on interacting spins in double quantum dots have been demonstrated successfully. Readout of the qubit state involves a conversion of spin to charge information, which is universally achieved by taking advantage of a spin blockade phenomenon resulting from Pauli's exclusion principle. The archetypal spin blockade transport signature in double quantum dots takes the form of a rectified current. At present, more complex spin qubit circuits including triple quantum dots are being developed. Here we show, both experimentally and theoretically, that in a linear triple quantum dot circuit the spin blockade becomes bipolar with current strongly suppressed in both bias directions and also that a new quantum coherent mechanism becomes relevant. In this mechanism, charge is transferred non-intuitively via coherent states from one end of the linear triple dot circuit to the other, without involving the centre site. Our results have implications for future complex nanospintronic circuits. Copyright © 2013 Macmillan Publishers Limited. All rights reserved.
Publication date
LanguageEnglish
AffiliationMeasurement Science and Standards; Security and Disruptive Technologies; Information and Communication Technologies; National Research Council Canada
Peer reviewedYes
NPARC number21270633
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Record identifier30d861e1-b831-4ccb-84cf-5d152654682e
Record created2014-02-17
Record modified2016-05-09
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