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dc.contributor.advisorBrataas, Arnenb_NO
dc.contributor.authorGislesen, Halvornb_NO
dc.contributor.authorSkarsvåg, Hansnb_NO
dc.date.accessioned2014-12-19T13:17:52Z
dc.date.available2014-12-19T13:17:52Z
dc.date.created2012-11-08nb_NO
dc.date.issued2012nb_NO
dc.identifier566409nb_NO
dc.identifierntnudaim:8181nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/246783
dc.description.abstractWe study the effect of an impurity potential on spin-memory loss in graphene. Various general methods for finding the spin-orbit related effect of a slowly varying impurity potential on a semiconductor have been examined. We have also revisited problems concerning electronic properties and spin relaxation in graphene. To this end, the bandstructure for graphene has been calculated through analytical and computational methods. The following results have been reproduced: Low energy excitations behave like massless relativistic particles with an effective speed of light at roughly 10^6 m/s. Intrinsic spin-orbit coupling splits the bands at the Fermi level. The importance of the $d$ orbitals for this effect is also shown. Extrinsic spin-orbit coupling induced by a perpendicular electric field give rise to a Rashba type Hamiltonian. Our novel results are related to extrinsic effects from an impurity. We have calculated the renormalised impurity induced spin-orbit coupling due to mixing of the conduction bands and the other bands. This renormalisation is at most comparable to the vacuum term, and thus cannot explain the experimental results on spin relaxation.nb_NO
dc.languageengnb_NO
dc.publisherInstitutt for fysikknb_NO
dc.subjectntnudaim:8181no_NO
dc.subjectMTFYMA fysikk og matematikkno_NO
dc.subjectTeknisk fysikkno_NO
dc.titleRenormalised Intrinsic and Extrinsic Impurity Induced Spin-orbit Scattering in Graphenenb_NO
dc.typeMaster thesisnb_NO
dc.source.pagenumber113nb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for naturvitenskap og teknologi, Institutt for fysikknb_NO


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