http://www.cnr.it/ontology/cnr/individuo/prodotto/ID310201

Nanoscale spin rectifiers controlled by the Stark effect (Articolo in rivista)

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Nanoscale spin rectifiers controlled by the Stark effect (Articolo in rivista) (literal)

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Alternative label

Rossella F.[ 2,1 ] ; Bertoni A.[ 3 ] ; Ercolani D.[ 2,1 ]; Rontani M.[ 3 ]; Sorba L.[ 2,1 ] ; Beltram F.[ 2,1 ] ; Roddaro S.[ 2,1 ] (2014)
Nanoscale spin rectifiers controlled by the Stark effect
in Nature nanotechnology (Online); NATURE PUBLISHING GROUP,, LONDON (Regno Unito)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Rossella F.[ 2,1 ] ; Bertoni A.[ 3 ] ; Ercolani D.[ 2,1 ]; Rontani M.[ 3 ]; Sorba L.[ 2,1 ] ; Beltram F.[ 2,1 ] ; Roddaro S.[ 2,1 ] (literal)

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Note

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[ 1 ] Scuola Normale Super Pisa, NEST, I-56124 Pisa, Italy [ 2 ] CNR, Ist Nanosci, I-56124 Pisa, Italy [ 3 ] CNR, Ist Nanosci, S3, I-41125 Modena, Italy (literal)

Titolo

Abstract

The control of orbitals and spin states of single electrons is a key ingredient for quantum information processing and novel detection schemes and is, more generally, of great relevance for spintronics. Coulomb and spin blockade in double quantum dots enable advanced single-spin operations that would be available even for room-temperature applications with sufficiently small devices. To date, however, spin operations in double quantum dots have typically been observed at sub-kelvin temperatures, a key reason being that it is very challenging to scale a double quantum dot system while retaining independent field-effect control of individual dots. Here, we show that the quantum-confined Stark effect allows two dots only 5 nm apart to be independently addressed without the requirement for aligned nanometre-sized local gating. We thus demonstrate a scalable method to fully control a double quantum dot device, regardless of its physical size. In the present implementation we present InAs/InP nanowire double quantum dots that display an experimentally detectable spin blockade up to 10 K. We also report and discuss an unexpected re-entrant spin blockade lifting as a function of the magnetic field intensity. (literal)

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