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Título: | Bipolar spin blockade and coherent state superpositions in a triple quantum dot |
Autor: | Busl, M.; Granger, G.; Gaudreau, L.; Sánchez, Rafael CSIC ORCID; Kam, A.; Pioro-Ladrière, M.; Studenikin, S. A.; Zawadzki, P.; Wasilewski, Z. R.; Sachrajda, A. S.; Platero, Gloria CSIC ORCID | Fecha de publicación: | 17-feb-2013 | Editor: | Springer Nature | Citación: | Nature Nanotechnology 8: 261-265 (2013) | Resumen: | Spin 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. | Versión del editor: | https://doi.org/10.1038/nnano.2013.7 | URI: | http://hdl.handle.net/10261/178277 | DOI: | 10.1038/nnano.2013.7 | ISSN: | 1748-3387 | E-ISSN: | 1748-3395 |
Aparece en las colecciones: | (ICMM) Artículos |
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