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dc.rights.licenseCC-BY-NC-ND
dc.contributor.advisorMorais Smith, C. de
dc.contributor.authorMiert, G.C.P. van
dc.date.accessioned2014-09-08T17:01:22Z
dc.date.available2014-09-08T17:01:22Z
dc.date.issued2014
dc.identifier.urihttps://studenttheses.uu.nl/handle/20.500.12932/18186
dc.description.abstractGraphynes represent an emerging family of two-dimensional carbon allotropes that recently attracted much interest due to the tunability of the Dirac cones in the band structure. We explore the effects of spin-orbit couplings, both Rashba and intrinsic ones, in these systems. First, we develop a general method to address spin-orbit couplings within tight-binding theory. We then apply this method to describe the effects of spin-orbit couplings in α, β, and γ-graphyne. We show how spin-orbit couplings can lead to various effects related to both topological and non-topological properties of their band structures. In α-graphyne, as in graphene, the Rashba spin-orbit coupling splits each Dirac cone into four, whereas the intrinsic spin-orbit coupling opens a topological gap. In β-graphyne, intrinsic spin- orbit coupling yields high- and tunable Chern-number bands, which may host both topological and Chern insulators, in the presence and absence of time-reversal symmetry, respectively. On the other hand, Rashba spin-orbit coupling can be used to control the position and the number of Dirac cones in the Brillouin zone. Finally, the Rashba spin-orbit coupling can close the band gap in γ-graphyne.
dc.description.sponsorshipUtrecht University
dc.format.extent5661910
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.titleTight-binding theory of spin-orbit coupling in graphynes
dc.type.contentMaster Thesis
dc.rights.accessrightsOpen Access
dc.subject.keywordsGraphyne, graphene, spin-orbit coupling, topological insulator, new materials, QSHE
dc.subject.courseuuTheoretical Physics


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