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Effective time-reversal symmetry breaking in the spin relaxation in a graphene quantum dot

Effective time-reversal symmetry breaking in the spin relaxation in a graphene quantum dot

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STRUCK, Philipp R., Guido BURKARD, 2010. Effective time-reversal symmetry breaking in the spin relaxation in a graphene quantum dot

@unpublished{Struck2010Effec-24816, title={Effective time-reversal symmetry breaking in the spin relaxation in a graphene quantum dot}, year={2010}, author={Struck, Philipp R. 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/123456789/24816"> <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/24816"/> <dcterms:issued>2010</dcterms:issued> <dcterms:rights rdf:resource="http://nbn-resolving.org/urn:nbn:de:bsz:352-20140905103605204-4002607-1"/> <dcterms:title>Effective time-reversal symmetry breaking in the spin relaxation in a graphene quantum dot</dcterms:title> <dc:creator>Struck, Philipp R.</dc:creator> <dc:contributor>Burkard, Guido</dc:contributor> <dc:rights>deposit-license</dc:rights> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2013-10-14T11:07:29Z</dcterms:available> <dc:creator>Burkard, Guido</dc:creator> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2013-10-14T11:07:29Z</dc:date> <dcterms:abstract xml:lang="eng">We study the relaxation of a single electron spin in a circular gate-tunbable quantum dot in gapped graphene. Direct coupling of the electron spin to out-of-plane phonons via the intrinsic spin-orbit coupling leads to a relaxation time T_1 which is independent of the B-field at low fields. We also find that Rashba spin-orbit induced admixture of opposite spin states in combination with the emission of in-plane phonons provides various further relaxation channels via deformation potential and bond-length change. In the absence of valley mixing, spin relaxation takes place within each valley separately and thus time-reversal symmetry is effectively broken, thus inhibiting the van Vleck cancellation at B=0 known from GaAs quantum dots. Both the absence of the van Vleck cancellation as well as the out-of-plane phonons lead to a behavior of the spin relaxation rate at low magnetic fields which is markedly different from the known results for GaAs. For low B-fields, we find that the rate is constant in B and then crosses over to ~B^2 or ~B^4 at higher fields.</dcterms:abstract> <dc:language>eng</dc:language> <dc:contributor>Struck, Philipp R.</dc:contributor> </rdf:Description> </rdf:RDF>

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