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ENTS: Entangled spin pairs in graphene

English title ENTS: Entangled spin pairs in graphene
Applicant Schönenberger Christian
Number 129378
Funding scheme Project funding (special)
Research institution Departement Physik Universität Basel
Institution of higher education University of Basel - BS
Main discipline Condensed Matter Physics
Start/End 01.03.2010 - 28.02.2013
Approved amount 286'308.00
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Keywords (10)

quantum transport; graphene; spin coherence; entanglement; Electron and spin transport; Spintronics; Superconducting Devices; Nanostructures; Magnetoresistance; Spin Filter

Lay Summary (English)

Lead
Lay summary
We are part of an European project which was granted under the ESF (European Science Foundation) call "Eurographene". This call targets physics and applications in the new material graphene. Graphene is a single monolayer of the parent compound graphite, a single-crystal of nothing, but coal. The consortium of this project consists of the following nodes: Pertti Hakonen, Helsinki University of Technology (HEL), Alberto Morpurgo, University of Geneva (GEN), Christian Schönenberger, University of Basel (BAS), Jaan Aarik,University of Tartu (TAR), Carlo Beenakker, University of Leiden (LEI), Laurens Molenkamp and Björn Trauzettel, University of Wurzburg (WUR). The long term goal of our work is an implementation of a source of entangled electrons in graphene. The injection of Cooper pairs from superconducting contacts and their splitting into different arms will be central to our interst in the beginning (for a similar recent experiment using semiconducting nanowires, see L. Hofstetter et al. Nature 461, 960 (2009)). In the coarse towards this long term goal, we will study novel properties in charge and spin-transport that route in new symmetries inherent to graphene. The Basel node will in particular focus on spin transport using ferromagnetic contacts as spin injectors and detectors.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Associated projects

Number Title Start Funding scheme
134619 Electric Transport Phenomena in Nanoscaled Devices 01.04.2011 Project funding (Div. I-III)
124670 Electric Transport Phenomena in Mesoscopic Devices 01.04.2009 Project funding (Div. I-III)
146139 Quantentransport Phänomene in Nanostrukturierten Devices 01.04.2013 Project funding (Div. I-III)

Abstract

This is relates to a full proposal within the call 09-EuroGRAPHENE-OP-021 of the ESF The general goal of this cooperate research proposal is to generate and manipulate spin-coherent single-electron and paired electron states in graphene. We would like to understand entangled spin pairs and the factors limiting their coherence in graphene. Graphene is the single layer of hexagonally packed carbon atoms. It has been showing a plethora of novel effects in transport, such as the half integer quantum Hall effect at room temperature and Klein tunneling. Moreover, coherent state manipulation has been demonstrated by a gate-tunable supercurrent. Graphene is a light material in which the spin-orbit coupling is expected to be weak because it is flat. This is different to carbon nanotubes, in which there is a substantial curvature induced spin-orbit coupling. Consequently, large spin-coherence times are expected in graphene making graphene an ideal material for quantum coherent state manipulation as proposed here.We aim to understand and utilize the extraordinary properties of graphene to achieve generation and detection of entangled spin pairs, a venture not achieved in any solid state system so far. We take advantage of weak spin-orbit coupling in this system which renders the spin-orbit relaxation time long and allows spin coherent behavior over long distances. Altogether, we hope to combine recent results on graphene, on ballistic transport, on spintronics and on quantum information processing to engineer a graphene based hybrid system which facilitates entangled spin pairs.
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