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Interfacial spin-orbit phenomena in 2D Dirac materials 
Monday, 29 October 2018, 12:00
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Interfacial spin-orbit phenomena in 2D Dirac materials

Aires Ferreira

University of York, UK

Short abstract:

Spin-orbit coupling has attracted enormous attention due to its pivotal role in nontrivial topological insulating phases and numerous relativistic transport effects with potential applications in spintronics. Recently, 2D van der Waals (vdW) heterostructures built from graphene and semiconducting dichalcogenides have emerged as strong contenders for fundamental studies of spin-orbit phenomena. When graphene is paired with group-VI dichalcogenide monolayers [MX2 (M = Mo, W; X = S, Se)], its band structure develops rich non-collinear spin textures, paving the way to a new generation of gate-tuneable 2D devices enabling optical and electrical manipulation of spins. This seminar will review recent progress towards understanding transport phenomena in vdW heterostructures with interfacial spin-orbit coupling. The focus will be on two dual relativistic transport effects, namely the inverse spin galvanic effect and the spin Hall effect. Coupled charge-spin transport in 2D vdW heterostructures is shown to be modulated by Berry curvature effects and scattering mechanisms strongly dependent on the sublattice/spin texture of interface-induced spin-orbit interactions. Of particular interest are graphene|MX2 bilayers, where sublattice-resolved spin-orbit coupling endows each valley with net spin polarization. Such a “valley-Zeeman” effect enables a wealth of interesting spin-dependent phenomena, from all-optical injection of spin currents and strongly anisotropic spin relaxation to a robust skew scattering mechanism. Finally, I will discuss charge carrier transport in ferromagnetic vdW heterostructures, where 2D magnetized Dirac bands with a non-collinear spin texture in momentum space engender an anomalous Hall effect with a distinctive experimental signature.

Location ICN2 Seminar Room
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