Effect of spin-orbit couplings in graphene with and without potential modulation
| Autor: | El Bouâzzaoui Choubabi, M. Ramezani Masir, François M. Peeters, Ahmed Jellal, Kh. Shakouri |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Physics
Condensed matter physics Graphene Condensed Matter::Other Superlattice Point reflection Dirac (software) Physics::Optics Electron Condensed Matter Physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Symmetry (physics) Electronic Optical and Magnetic Materials law.invention symbols.namesake Dirac fermion law symbols Spin-½ |
| Zdroj: | Physical Review B |
| Popis: | We investigate the effect of Rashba and intrinsic spin-orbit couplings on the electronic properties and spin configurations of Dirac fermions confined in: (i) a flat graphene sheet, (ii) a graphene wire with $p$-$n$-$p$ structure, and (iii) a superlattice of graphene wires. The interplay between the spin-orbit interaction mechanisms breaks the electron-hole symmetry and the spin configuration induced by Rashba spin-orbit coupling lacks inversion symmetry in $k$ space. We show that the Rashba spin-orbit interaction doubles the Fabry-P\'erot resonant modes in the transmission spectrum of a graphene wire and opens new channels for the electron transmission. Moreover, it leads to the appearance of spin split extra Dirac cones in the energy spectrum of a graphene superlattice. It is shown that the spin of the electrons and holes confined in a flat graphene sheet is always perpendicular to their motion while this is not the case for the other nanostructures. |
| Databáze: | OpenAIRE |
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