Electron Spin Relaxation in Graphene Nanoribbon Quantum Dots


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DROTH, Matthias, Guido BURKARD, 2013. Electron Spin Relaxation in Graphene Nanoribbon Quantum Dots

@unpublished{Droth2013Elect-24793, title={Electron Spin Relaxation in Graphene Nanoribbon Quantum Dots}, year={2013}, author={Droth, Matthias and Burkard, Guido} }

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/24793"> <dc:rights>deposit-license</dc:rights> <dc:creator>Droth, Matthias</dc:creator> <dcterms:abstract xml:lang="eng">Graphene is promising as a host material for electron spin qubits because of its predicted potential for long coherence times. In armchair graphene nanoribbons (aGNRs) a small bandgap is opened, allowing for electrically gated quantum dots, and furthermore the valley degeneracy is lifted. The spin lifetime T_1 is limited by spin relaxation, where the Zeeman energy is absorbed by lattice vibrations, mediated by spin-orbit and electron-phonon coupling. We have calculated T_1 by treating all couplings analytically and find that T_1 can be in the range of seconds for several reasons: (i) low phonon density of states away from Van Hove singularities; (ii) destructive interference between two relaxation mechanisms; (iii) Van Vleck cancellation at low magnetic fields; (iv) vanishing coupling to out-of-plane modes in lowest order due to the electronic structure of aGNRs. Owing to the vanishing nuclear spin of 12C, T_1 may be a good measure for overall coherence. These results and recent advances in the controlled production of graphene nanoribbons make this system interesting for spintronics applications.</dcterms:abstract> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2013-10-14T11:35:19Z</dcterms:available> <dcterms:issued>2013</dcterms:issued> <dcterms:rights rdf:resource="http://nbn-resolving.org/urn:nbn:de:bsz:352-20140905103605204-4002607-1"/> <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/24793"/> <dcterms:title>Electron Spin Relaxation in Graphene Nanoribbon Quantum Dots</dcterms:title> <dc:language>eng</dc:language> <dc:creator>Burkard, Guido</dc:creator> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2013-10-14T11:35:19Z</dc:date> <dc:contributor>Droth, Matthias</dc:contributor> <dc:contributor>Burkard, Guido</dc:contributor> </rdf:Description> </rdf:RDF>

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